It's not quite the same as the 1911. The internals of the slide, firing pin safety, firing pin, spring, extractor and firing pin stop are similar but the lower half of the gun is completely different. Also be aware that if you push down too far on the ejector that it will lock in place. There is no trigger bow. Take a good hard look at the schematic in the users manual and go slow if you take the gun all the way apart.
Sig P238- Broken Ejector