Standard R32 gtr power steering pump, with rear section for hicas.
3 kg without any brackets.
R33 gtr power steering pump, which doesnt have the back bit as the hicas isnt hydrolic.
2.1 kg without any brackets.
The brackets that bolt onto the block are pretty much the same in weight, although you do need to use an R33 one to fit an R33 pump to an R32.
Also you need to bolt the bracket off the R32 one that the adjuster plate mounts to as the hydrolic guide at the top is at the wrong angle on the R33 one.