1998 volvo engine code 56 difference for awd
 

i just bought a 1998 volvo xc70 wagon with a bad motor its a awd car, i went to the u-pick yard and pulled out another motor, it too was a code 56 motor, which i read is not really a readily plentiful engine, whats the diffenence in the block for a awd car, ive got another 1998 s70 and i think the engine code on that is a 57