Yes.
Here's the chronological order:
Ilsa: She Wolf of the SS (1975)
Ilsa, Harem Keeper of the Oil Sheiks (1976)
Ilsa the Tigress of Siberia (1977)
Greta - Haus ohne Männer (1977) aka Ilsa, the Wicked Warden (1977) ("Unofficial Ilsa film")
http://www.cult-labs.com/forums/poll...best-ilsa.html