NO, it's not the motor mounts that are different. The engine block is cast for different mounts in different locations. You can't bolt on RWD mounts because there is no place to bolt them to.So just the motor mounts are different? The bell housing is the same?
the 2.2 from the cavalier has the bolt holes for front or rear wheel drive motor mounts. if it ends up being to much of a pain to go to the 6 cylinder, the 2.2 will go in from another s10.
this site lists everything you need to know about the cavalier/s10 motors, as far as swap and mixing parts