fuel pump swap

I'm working on repairing an 80 series landcruiser with my Dad, but he's out of ideas with this problem. I'm still learning the ropes, so bare with me. Any advice is appreciated. I recently swapped out my leaking injector pump with one from a wreck that had no previous issues. During this...

Both 3B engines. They both have different fuel pumps. (A square ish one and a long one. Are the pumps able to be swapped. Like are they the same mounting points etc Cheers