I think the stock parts are the same. Really the same rifle in different chamberings. Bolt and follower aren't, of course. Never found one of either in decent enough condition at the same time as having the money to buy either.
However, Gunparts lists 'em as different part numbers, but at the same price. Mind you, that's likely an inventory thing. Quite literally as part #413500A and #413500B. The P17 rear being the 'B' part. Same $22.70US for either though. 413440A and 'b' for the upper bands(muzzle). $6.55US for either.