Depends who you ask...
Ra is the Rally model, so being stripped out, without extra's and having wind up windows etc makes it a real RA.
However, there were also STI RA's made. They had more extra's, and were heavier (off the top of my head, i think around 60-80kg), but came with roof vent, DCCD, firm sti seats and better spec'd engines...
Much like the later Spec C's came in two flavours, one stripped out (RA) with wind ups, small brakes and DCCD, the other with electric windows, Brembo's and no DCCD.
Both, like the GC8 Ra's, were lighter than the equivilent STI model, but one was weighted in favour of comfort, and one wasn't... ;D
Again, off the top of my head:
GC8 STI: 1250kg
GC8 STI Ra: 1190kg
GC8 Ra: 1140kg
GDB STI(V7): 1490kg
GDB STI RA(V7): 1390kg
GDB STI Spec C (V7): 1340kg
GDB STI RA Spec C (V7): 1290kg