The GNR ones had quite different panelling styles - I often thought, though, that a number of GNR (England) coaches could either be "kitbashed" into GNR(I) "2ft-rule" types, or as bogies.
If Hattons also decide to release the chassis of these things as a separate item, scratchbuilding of other Irish types would be made a great deal easier. The NCC, MGWR, BCDR, GNR, GSWR, WLWR and DSER all had their own very distinctive styles. And then you get to West Cork....the Hattons "genesis" isn't hugely unlike one or two of theirs.
There's a Roxey 48ft third that is half-ways close to one MGWR bogie - might get one some day! But that's a different issue. For the "genesis" thing, it resembles GSWR types best. Naturally, SSM kits provide ACTUAL GSWR types.