Wouldn't be able to use an AccuStock (or AccuFit stock) without pulling off the barrel and changing the recoil lug as those stocks use one that's shorter and shaped a little differently.
As for the magazine compatibility, all of the Savage's made since 2008 use the same center-feed magazine housings (the upper metal part of the magazine) - except those using the AICS mags in recent years. What mag you can use really depends more on the stock you have. Your Trophy Hunter uses the Axis style magazine with the integrated retention clip on the plastic bottom cap. The Model 14 walnut stocks (and all the Accu stocks) use the Premium style magazine (metal bottom cap) that uses a separate bottom metal that the stock is inlet to accept. As such you would need the stock, the separate bottom metal, and the metal magazine bottom plate to put a walnut Model 14 stock on your current rifle.
I know, it's confusing - you can thank Savage for their inability to just pick one and use it across their whole product line.
Here's a short write-up and video I put together a few months back that might make it a little easier to understand.
http://www.savageshooters.com/conten...is-and-Premium
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