Just found your thread while looking for other info. I'm surprised no-one else has got back to you, although i haven't been active on here for quite some time.

Great to see that the rifle shoots so well- those replica stocks made in India and marketed here appear to have some good feedback. As far as the bolts go, I also noticed that my Lithgows' do have a slightly different profile to the Britishicon made ones. If the bearing surfaces are even, and the headspace is within spec, then it's fairly safe to say that it shouldn't be an issue. Probably a variation in tooling at different factories would be my guess, but maybe someone else out there has some definitive answer.

Tolerances and minor variations appear a lot with these rifles, and inter war and post ww2 rifles do tend to have less variation than mass produced wartime ones. As always, if in doubt, have it checked by a competent gunsmith. Have fun with it.