I think, within reason, a steam loco is a steam loco, the same for diesels. There are now enough sound profiles available, to satisfy most needs. I have run steam loco's with the wrong profile, and the only thing that can really stand out is the whistle - the A4 and Britannia profiles have a superb chime whistle which sounds very realistic, but probably would not sound correct on a Bulleid Pacific - that's if your that concerned😕. I would not put off buying a loco because there was not the correct sound profile yet available.