Also remember the 4 cylinder K member and the V8 are slightly different.
Probably for what you are doing the answer is that there is no difference. If you are doing a high point restoration on a very early car there are slight differences. The engine steady rods are in different locations but except for a very few early ones all of the holes are there. If they are missing, get out the drill.whats the difference between the 4cyl and V8 crossmembers?i just wanted to know if a pick up k member is the same as a passenger k member,i have the option of using one in my car but i havnt seen it in person and didnt know if it was the same