I once put an early saph dash into an XR4i which i presume will have the same mounting points as a 3dr.
All the main mounting points were in the same place but i was just using the top half of a saph dash and fitting all the vents, switches, dials,etc from the 4i to try and keep it as original as possible.
I got it all in in the end but took a bit of time to get it to look right but once in looked ok.
I used the original lower half of dash and this fits ok but there were differences around steering column area with one or two gaps.
You will probably need the A pillar trims from a saph aswell as they are different at the bottom where its meets the dash top.
From what i remember the curve of the saph dash is slightly different along the windscreen but isn't noticable once in.
It was a few years ago so might have missed something.
Chris