I think the exhaust itself is the same but the tail pipes are different hence the wheelbarrow comments from chim owners- our tail pipes come upwards, chim pipes are level.
I know cash is tight for most people at the moment (especially me) but it may be worth shelling out for a ss system as some of the original mild steel exhausts may be coming to the end of their life anyway. Just a thought.
I have a pre-cat and the whole exhaust system was mild steel as fitted when it left Blackpool. Not sure if the later Griffs came with SS as factory fitted. I have now replaced the mild steel system including the manifolds with SS.