s10 frames

looking for an answer to a ? i have about frames. a friend asked me if a 98 cab and bed would fit on his 89. if not what would he have to modify or fabricate to make it work? he is in need of both cab and bed, and well he came across a guy that will sell him a 98(no motor or tranny) for a $100. the only thing i could answer him was the fact that he could use the rearend for his truck.
thanks for all the help on this in advance and also for past ?s.