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Yes and no. The middle hanger is on the wrong side, so won't fit the bit on the car, but the exhaust will mate up and the tail-end fittings are fine. Classic owners either a) leave the middle hanger unconnected, or b) cut it off and weld it on the other way around.
The classic centre section is slightly longer. I think by around 100mm or so.
I know this cos I had both parts in my shed at one point and someone asked the same Q as the op.
I did fit the newage STI [MY03] backbox to my RB5 and it fitted fine, other than the hanger as mentioned earlier. The 3rd bracket isn't really needed anyway.imo