Centennial dictionary/Simplified manual

Hi all,
I have a Centennial dictionary (an accident - I ordered it when I didn't know about the differences) but am learning from a Simplified manual.
Apart from the brief forms and the Simplified oo hook on its side, are there any other big differences I should watch out for? Just casually leafing through it, I can't see any really obvious ones.
P.S. Yes, I have checked Andrew's really useful version descriptions on angelfishy, but Simplified to Centennial is three steps, so I'm not sure how different they are.

(by kevinwal for everyone)