Can I put a mitsubishi eclipse motor in a 1996 mitsubishi merage?
It depends. What’s your budget?
If you have enough money you can put just about any engine in any car. Just ask Jay Leno.
In the real world, it’s highly unlikely that an engine from an Eclipse (who knows what year?) will fit in a '96 Mirage, much less start and/or run.
I suggest you forget this engine swap idea. Modern computers have made such things virtually impossible.
If you need an engine FOR a 1996 Mirage, you need an engine FROM a 1996 Mirage.
I would try and find a mitsubishi specific board. Some cars (Subaru) are easier to swap engines even going back 10 years.