Rears should be the same (both had an antiroll bar), Mk1 fronts are longer than Mk2 items so if you fit Mk2 front's you'll get an extra 20mm or so drop.

Both can be interchanged though, but be prepared to hunt about for the right springs for the front if you want an even drop all round if your mixing and matching mk1/2.

Rally design will do you any poundage and length springs though.