I think they're duplicates as well.
Kilers
http://www.hkmdb.com/db/movies/view.mht ... ay_set=eng

Killers 5
http://www.hkmdb.com/db/movies/view.mht ... ay_set=eng

Both have same directors, actors and Chinese names.

Killers Five has more info, I would therefore retire "Killers", but move over the original theatrical run on to Killers 5:
Theatrical Run: 02/14/1969 - 00/00/0000

ummm, both those links point to the same film

Found the other one though, and I'm pretty sure you're right about it being the same film. I updated the release date on Killers Five, but haven't removed the "Killers" title from the db... this is the link:

http://www.hkmdb.com/db/movies/view.mht ... ay_set=eng

I'll let somebody else make the call on deleting it