The top and bottom ones, certainly - they are very WLWR (and thus, after 1901, GSWR)-esque. They don't actually look like NCC stock, perhaps surp[risingly, as they have these bowed-in ends, common in GWR and Midland Railway (of England) worlds. The only company here to have that, and their stock of bogie coaches only numbered about six (bit like the BCDR!) was the Waterford, Limerick & Western.
The middle coach, with clerestorey roof, is utterly unlike anything that ever ran here. The style and proportions of the roof isn't like anything here, nor (with the exception of the above) the ends, the panelling style is also not similar to anything here, and nor are those high-up small windows.
The WLWR had two brake thirds, whose cloest relative would be the bottom of those three images. One lasted until the late 1940s, the other about 1952/3 as far as I remember, therefore one of those would only be in GSR maroon or the dark green, fully lined CIE livery. Both were gone before the A, B101 or C class diesels turned a wheel, though, so they'd be for a steam-era layout.
I got one of the kits of the coach at the top, with the intention of putting flat ends on it, which would make it passably GSWR in appearance (two foot rule applies!), but I haven't got round to doing anything with it yet. Moreover, I've lost the bogies; no matter, the thing cost me €5 in a scrap bin sale at an exhibition somewhere.....!
Meant to add, if you're not worried about the "English" ends, in MR / LMS / NCC livery they'd do well for an NCC-area layout.