I just discovered that Maan Lee-Hung and Fanny Fan Lai are one and the same. Maan Lee-Hung was her name when she started out acting in the Cantonese division of Shaw Brothers before moving over to the Mandarin division.
Maan Lee-Hung
http://hkmdb.com/db/people/view.mhtml?id=2636&display_set=eng
Here is the proof at HKFA:
Fan Lai filmography
http://ipac.hkfa.lcsd.gov.hk:80/ipac20/ipac.jsp?npp=10&ipp=20&profile=hkfa&aspect=basic_search&term=Fan%2C+Fanny%2C+1940%2F10%2F16-&index=NAMEBRP&uindex=&oper=&ri=2&session=V1O8932I49616.254&menu=search&aspect=basic_search&npp=10&ipp=20&profile=hkfa&ri=2&source=192.168.110.61%40%21horizon&sort=3100083&go_sort_limit.x=9&go_sort_limit.y=9&limit=
A Pretty Girl's Love Affair entry showing "Man Lei Hung (aka Fanny Fan Lai)"
http://ipac.hkfa.lcsd.gov.hk:80/ipac20/ipac.jsp?session=V1O8932I49616.254&profile=hkfa&uri=full=3100024@!38928@!1&ri=2&aspect=basic_search&menu=search&source=192.168.110.61@!horizon&ipp=20&staffonly=&term=Fan%2C+Fanny%2C+1940%2F10%2F16-&index=NAMEBRP&uindex=&aspect=basic_search&menu=search&ri=2
Fan Lai's bio from the Celestial DVDs also mentions this, but gives her earlier name as Wan Li-Hong.
http://hkmdb.com/db/people/bio.mhtml?id=2818&display_set=eng