Yes, there is a difference between the 1.5 covers and the 1.6 covers. The best of my recolection its the little bracket coming off the front of the pump bracket. Where it bolts to the head is the same.
I've had them on and off a thousand times, and still its kind of a pain to get them off and on. The don't just pop on and off, you have to wiener them in there. The belt kind of rubs alittle, the cover bends a little, and suddenly it sort of slips on.
Anybody else have a better explianation?