Briar

So I recently bought a really nice H22 swapped accord. Its having issues with the ecu as its not the correct ECU for the engine, and has intermittent issues like stalling randomly, running rich, running lean, trouble starting up, engine light coming on and off, etc. I took a look and the ECU is a p39, so I ordered a p13 to replace it. My question is; will there be any additional things I will need/need to do for it to work properly or will it be plug and play?