savage fp-sr & fcp-k difference

other than the muzzle breake and flute barrel on savage what other difference between the two? iheard the lug, trigger etc etc is all different?

fp-sr: internal box magazine, 22" threaded barrel with a cap, and the bolt release is still on the side of the receiver

fcp-k: detachable magazine, 24" flutted barrel with brake, newer models have the bolt release in front of the trigger guard

Other than that I'm pretty sure that they are exactly the same, lug, trigger, etc.