98 actions have two different lengths. There is the short Yugo action and the "Standard length" action. They also have two different ring sizes. As in standard length but small ring Mexican Mausers. All are good tough actions.
Just about any 98 parts, from either type will interchage, other than the bolts, trigger guards and stocks.
Google the action specs on the Internet, or go to a Mauser site. They will give you all of the dimensional specs.
At first glance, they are identical.
Unless you can do the work yourself, building a custom rifle on a surplus Mauser action will cost a lot more than a commercial action. At todays prices, commercial sporting rifles are cheaper to buy for their actions than surplus Mausers.
A 1909 Argentine Mauser is a "Standard" length action and has a hinged floorplate, if it hasn't been swapped out by a gunsmith or bubba. They are very nice actions. There are some well worn dogs out there as well.
If it were economical to bring in stripped actions or complete barreled actions, there are importers in Canada that would do so.
If you are looking for a decent milsurp to keep as is to shoot, there are a lot to choose from and at least 5 popular chamberings available, 8x57, 7x57, 7.62x51 Nato, 30-06 and 7,65x53. There are a few odd balls out there as well chambered in rimmed cartridges Like 303 British and Siamese Mauser. There are also special competition chamberings.
Go to milsurpknowledge.ca there are picture and descriptions of most of them as well as lots of other surplus rifles. That will give you a place to start. You don't mention which city you live in or are close to. Most places of any size in Alberta have a firearms store. Wholesale Sports, won't have what you're looking for. Single owner retail stores are what your looking for. In Edmonton, there is MilArm, in Lethbridge there is Precision Sports and in Calgary there is the Soldier Shop and a couple of others like The Shooting Edge.
Check out the banner advertisers on this site at the top of the page as well. Tradex has some decent 1912 Mausers for sale in 7x57 and some 7.62x51 conversions. Check out some of the others as well. There is also a list of advertisers section to check out. Have fun and before you know it, you will have put in several hours in front of yhor computer.