1) are all look keo cleats the same? i.e., do the same cleats fit their keo max, keo classic 1/2/3, keo sprint, keo blade pedals?

2) i see in other bike forums discussion of look/xpedo cleats as if they're interchangeable. are they? Can i use an xpedo cleat with a look pedal? or, put another way, can I use a look cleat for a pedal designed for/supplied with an xpedo cleat?

thanks, sorry if these are stupid but after a dozen internet searches I just can't seem to find these answers plainly stated.