C. ÂPretoria and C. Bengal Tiger are the same cultivar. C. ÂTropicanna Gold is a different cultivar. I posted photos of Pretoria (aka Bengal Tiger) vs. Tropicanna Gold at the link below on this forum group:
http://forums.gardenweb.com/forums/load/canna/msg0700472120184.html

I believe the information attached to this link explains the very basic differences.

Regards,
Kent

I even posted on that thread, did not remember it at all. Thank you again.....

I had noticed your post on the thread but was not going to mention that. Trust me; we are all guilty of our own oversightsÂ!
Kent

I was surprised to see my post. I didn't think I visited this forum very often. :)

At one time, I had both but labels got mixed up so now I'll wait until they bloom to see.