Different yes, but I have become a believer in the taper mount. I have two Sig cans, 338 TI and 7.62 SRD. The tapered shoulder is superior to standard shoulder...never had one shoot loose. (Can’t say that for my other 6 cans)And yes, the Sig 338 TI mount will work fine with a traditional threaded muzzle, just use the included rock set.