No, not without fabrication.
Yes it will fit.
Yes
An alternator from a 2000 Chevy blazer will fit a 2002 S10 blazer with a little fabrication.
Will a Chevy blazer engine fit in a Chevy s10 pickup
Will a Chevy Blazer engine fit in a Chevy s10 pickup
Yes, if they are of the same generation.
Yes
Yes
No.
any s10 or sonoma up to 93 and any blazer jimmy up to 94
Yes
if it's out of a 95 blazer it will work