The various BR bogies were widened for use in Ireland as I'm sure you're aware. The MM Cravens and Mk2d stock previously released have under scale width bogies that sit too far in under the tumblehome.
The IRM P42 bogies look right. They still work fine for 00 gauge because the wheels are barely visible from the side anyway, concealed largely by the bogie side frames.
I haven't heard any complaints about the IRM method (for me it'll be a godsend), which is all I'm advocating. Indeed MM diesels DO have scale width bogies and have done since the babies were released, allowing straightforward gauge widening of all these locos.
Maybe in an effort to reduce costs, the bogies for the MM Cravens and Mk2d stock used existing 00 tooling belonging to the contract manufacturer.