97 Buick Skylark Quad Four

Hi to all the good folks here on the board. Sorry I don't contribute much, but I don't know much. My friend has a 97 Buick with a blown Quad Four engine and a guy down the street has a 92 Pontiac that a truck ran over the back end but has a very good low millage Quad Four engine. The question is, will they interchange and if not, where will the problem lie? Thanks.