The ABF pickup is a little different and picks up from a little lower than other pickups, but shouldn't really be a problem unless your steel sump has already taken a beating.

^^1.6 diesel pickup at top, ABF at bottom.
I'm running an ABF with steel sump using a diesel pickup - but only because my sump has half-caved in, making the ABF pickup foul the bottom.
You can sometimes get away with re-using rubber gaskets, cork gaskets won't be much good 2nd time round tho.
9A oil pump is same height as an ABF one, but KR one is 6mm shorter and has a different spline I believe.
So yeah, stick with the ABF oil pump, but it might be worth checking clearance with some plasticine before you bolt everything up.