I tried to identify as many source films as I could that hadn't been done already. There are still a few unknowns but I managed to identify the country of origin for all of them. Though I gave this task a bit of time, the only ones I did a proper deep dive on were the ones I discovered were Korean. I've added a few details for these, but not added the entire cast as it would take too much time away from my main focus and I'd need to check who had been cut out of it. I'll eventually cover all these Korean films in the future anyway, so it's not a huge deal. For those that had already had the source film or country of origin noted on the HKMDB, I added it to the notes section and connected the films by hyperlink where possible.

Ninja The Protector [1986] --- STILL unknown Taiwan
https://hkmdb.com/db/movies/view.mhtml?id=15098&display_set=eng

Hitman The Cobra [1987] --- Kumander Sumulong [1984] Phi
https://hkmdb.com/db/movies/view.mhtml?id=15150&display_set=eng

Ninja Operation 2: Way Of Challenge [1987] --- STILL unknown Taiwan
https://hkmdb.com/db/movies/view.mhtml?id=15141&display_set=eng

Challenge The Ninja [1986] --- Twin Fists For The Blackmasters [1979] Phi
https://hkmdb.com/db/movies/view.mhtml?id=15149&display_set=eng

American Force 4: Soldier Terminators [1988] --- STILL unknown Phi
https://hkmdb.com/db/movies/view.mhtml?id=15775&display_set=eng

American Commando 7: Sweet Inferno [1987] --- Spoony Love [1982] Taiwan
https://hkmdb.com/db/movies/view.mhtml?id=15915&display_set=eng

American Force 2: The Untouchable Glory [1988] --- STILL unknown Phi
https://hkmdb.com/db/movies/view.mhtml?id=15773&display_set=eng

Official Exterminator 4: Goddess Mission [1988] --- Pink Thief [1982] Taiwan
https://hkmdb.com/db/movies/view.mhtml?id=15163&display_set=eng

American Force: The Brave Platoon [1988] --- unknown Phi
https://hkmdb.com/db/movies/view.mhtml?id=15772&display_set=eng

Official Exterminator 3: Joy for Living Dead [1987] --- Doce Delírio [1983] Brazil
https://hkmdb.com/db/movies/view.mhtml?id=15162&display_set=eng

War City 4: Kingdom of Power [1988] --- unknown Phi
https://hkmdb.com/db/movies/view.mhtml?id=15912&display_set=eng

War City 3: The Extreme Project [1988] --- Deadly Brothers [1981] Phi
https://hkmdb.com/db/movies/view.mhtml?id=15911&display_set=eng

Warriors Of America: L.A. Connection [1989] --- Yong-pal In L.A. [1986] Kor
https://hkmdb.com/db/movies/view.mhtml?id=15757&display_set=eng

War City 5: Law of Honor [1989] --- Maynila 1970: Panganib Araw At Gabi [1979] Phi
https://hkmdb.com/db/movies/view.mhtml?id=15913&display_set=eng

Zodiac Power 2: Evil Destroyer [1988] --- The Young Dragon [1979] Taiwan
https://hkmdb.com/db/movies/view.mhtml?id=15899&display_set=eng

American Commando 10: The Dragon Combo [1989] --- unknown Taiwan
https://hkmdb.com/db/movies/view.mhtml?id=15918&display_set=eng

American Commando 9: Guns to Heaven [1989] --- The Guy At Simenting [1981] Taiwan
https://hkmdb.com/db/movies/view.mhtml?id=15917&display_set=eng

U.S.Catman 2: Boxer Blow [1990] --- 7 Phra Kan [1983] Thai
https://hkmdb.com/db/movies/view.mhtml?id=15896&display_set=eng

American Commando 8: Naked Revenge [1989] --- The Reformed Gambler [1981] Taiwan
https://hkmdb.com/db/movies/view.mhtml?id=15916&display_set=eng

U.S.Catman: Lethal Track [1990] --- unknown Thai
https://hkmdb.com/db/movies/view.mhtml?id=15895&display_set=eng

Royal Destiny [1995] --- 3 source films, Queen Of Phoenix + Royal Angels 1 +2
https://hkmdb.com/db/movies/view.mhtml?id=15904&display_set=eng

Rings Untouchable [1992] --- Puga [1980] Phi
https://hkmdb.com/db/movies/view.mhtml?id=15903&display_set=eng

Fight The Kickboxer [1990] --- unknown Phi
https://hkmdb.com/db/movies/view.mhtml?id=15900&display_set=eng

Queen of Phoenix: Against Destiny [1990] --- Women Are Dangerous [1988] Taiwan
https://hkmdb.com/db/movies/view.mhtml?id=15902&display_set=eng

Year Of The King Boxer [1992] --- Dae-nam [1988] Kor
https://hkmdb.com/db/movies/view.mhtml?id=15893&display_set=eng

The Fighter The Winner [1991] --- Grease Gun Brothers [1985] Phi
https://hkmdb.com/db/movies/view.mhtml?id=15905&display_set=eng

Kickboxer King [1992] --- Thai Police Story [1986] Thai
https://hkmdb.com/db/movies/view.mhtml?id=15901&display_set=eng

Born A Ninja [1983] --- not c+p but year 1983
https://hkmdb.com/db/movies/view.mhtml?id=15894&display_set=eng



Thunder Score [1988] --- STILL unknown Thai
https://hkmdb.com/db/movies/view.mhtml?id=15972&display_set=eng

Fatal Command --- unknown Phi
https://hkmdb.com/db/movies/view.mhtml?id=15964&display_set=eng

Super Platoon [1987] --- Nuk Rob Dum [1987] Thai
https://hkmdb.com/db/movies/view.mhtml?id=23590&display_set=eng

Ninja Project Daredevils [1986] --- A Boy At His Age Of 13 [1974] Kor
https://hkmdb.com/db/movies/view.mhtml?id=15938&display_set=eng

Ninja In The Killing Field [1987] --- STILL unknown Thai
https://hkmdb.com/db/movies/view.mhtml?id=15925&display_set=eng

Rage Betrayed [1988] --- STILL unknown Thai
https://hkmdb.com/db/movies/view.mhtml?id=15941&display_set=eng

Ninja In Action [1988] --- The Outlaw [1982] Taiwan
https://hkmdb.com/db/movies/view.mhtml?id=15968&display_set=eng

Ninja, Warriors From Beyond [1987] --- Maestro Bandido [1983] Phi
https://hkmdb.com/db/movies/view.mhtml?id=15967&display_set=eng

Fire Operation [1987] --- Diablo Force [1986] Phi
https://hkmdb.com/db/movies/view.mhtml?id=18350&display_set=eng

Top Mission [1987] --- Diablo Force [1986] Phi
https://hkmdb.com/db/movies/view.mhtml?id=16679&display_set=eng


Cheers