I have a 98 Breeze 2.0L so what variation would appeal most to my car in terms of engine / trans swapability?

Does swapping out engine or trans with not the same model mean computer / wiring / engine mount incompatibility?

Id like to keep the same size engine, i am at the salvage yard allot and i see plenty of these cars just sitting about and i think it be a good idea to have extras.

My car has 150k and everything else has broken but the expensive things. Iv already payed too much money and work into this car to just sell or trade.

I'm getting cynical