as long as they have the same engine, drive train, and ecu?
sure
Will a Chevy blazer engine fit in a Chevy s10 pickup
Yes it will fit.
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
Yes
Yes
No.
Yes. Very easily. They are built on the same body, but the blazer is the suv and the s10 is the truck.
Will a 2000 blazer transmission fit a 1998 s 10 chevy 4x4 truck
No it will not SORRY.
Yes
Yes.