Bed interchange

[59cheviac]

Please help out a newbie with what is probably a common question. I am rebuilding a 68 short stepside 4x4 that has a completely rusted out bed. Will either the newer or older stepside beds interchange without welding, fabricating, etc. I don't mind drilling new mounting holes or redoing wiring, but thats about it. I have a chance to get a nice bed from a 65 and would like to know what I may be up against. Thanks in advance!