Im looking at putting an lsd and 4.9 final drive in my B16a with hydro box, and i can get the final drive at a good price but its apparently only for the B18c type R???

What are the differences between the B16a, B18c and B18c type R diffs and gearboxes?
Will a B18c type R lsd fit into the B16a hydro box?

Thanks in advance
Blake