I have a Stiga 30-06. OP asked what are the differences. Virtually all of them started as M1894 or M1896 built as military rifles at Carl Gustafs armoury. (A few very early ones made in Germany) M94 and M96 built at same time for many years - the 94 was for cavalry - short (17.7") barrel, bent bolt; the 96 was for infantry - long barrel (29"), straight bolt. All chambered for 6.5x55; all receivers identical. By 1940's, some production moved to Husqvarna factory - Husqvarna made sporting rifles to M94/M96 specs, but without thumb cut on left side of receiver - no thumb cut by Husqvarna was approved for their runs of M38 (mid-length barrels) for Swedish military. Lack of thumb cut did not "strengthen" receiver as far as cartridge PSI, but appears to stiffen it. For some (me), this makes the Husqvarna no-thumb-cut more desirable. 10's of thousands of these sold off as surplus in 1950's, especially the M94's. Stiga and other companies bought up the surplus and converted to sporter - quite common - it is how Sako/Tikka started out, Parker Hale, Vapon Depoten, Voere, etc. used Swedish M94/96/38 and various country's milsurp Mauser 98's as well.
My Stiga has barrel made by Schultz & Larson (Denmark target barrel maker), with Danish proof stamps. Longer than normal throat would help handle breech pressure. Given that it was proof tested in 1950's, and in great shape, I have no concerns about its ability to handle standard SAAMI or CIP 30-06 loads.
Cracks at tang of mauser (94, 96, 98) are due to wood stock shrinking and/or loose action screws allowing receiver to move rearward in stock under recoil - tapered rear tang acts as wedge to split the stock. Can repair crack with glue and cross pins, but must tighten up the bedding at the recoil lug and provide clearance at rear of tang to prevent recurrence.
I have never seen a chrome lined mauser barrel, but that doesn't mean much. No doubt someone made them as aftermarket barrels?
See the book "The Mauser in Sweden; Crown Jewels" by Dana Jones for more information about Swede mausers.