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Colt Mustang grips do not fit, not even close enough to modify.
Trigger and magazines interchange, don't know what else.
Probably FCG interchange OK, but I don't think the Sig has that little lever down in the magwell that is so troublesome on the Colt.

Several people making solid aluminum triggers for both Colt and P238.
I haven't seen a skeletonized version

I have not tried the 10-rnd mag. IIRC they are made by the same company that supplies the OE Colt mags, and those fit very well.

Yes, it's been a while since I shopped grips. Thanks for the links

Mine came with the plastic grips, which I don't like. Sig won't sell the wood grips separately.
Aftermarket wood grips are much more expensive than most other guns - why is that?

If you need mags, buy the Colt mags from CDNN. They are priced right, and they have +1 and 10-round options

I carried mine about 6 months, then went back to the LCP just because of size and weight (summertime).
I may have to dig the Sig back out and renew the relationship.