I'd say they're pretty equivalent. Mazanec can be a really good goalie, but needs work on the blocker, which is already a challenge as a left handed keeper. Tokarski is more inconsistent. At times he looks like he can save about 25-30 shots a night, but then others will have him pulled after 10 shots on him. Both are solid AHL starters, though.
Huska has one more year after this year (unless he goes pro this offseason), so I could see NYR bringing some help in net after this year. Halverson and Nell are RFA's and most likely gone (maybe one comes back) and Tokarski and Mazanec are UFA's at season's end. That'll only leave the organization with the following depth....
Lundqvist
Georgiev
Shesterkin *Hypothetically*
Huska *If he goes pro*
-Lindbom
-Wall
Was once was a position of depth could become nonexistent in the coming years. I could see NYR taking a stab at another in this draft class (which I think is strong for goalies).