The 450 MARLIN is really a re-invention of the 458 Two-Inch American which was developed by Frank Barnes a few decades back. (1962 or 63) Marlin simply added a lawyer approved belt that was far enough forward that it cannot be loaded into another magnum chamber.
The 458 Two-Inch American was a 458 Winchester that was shorten to have a 2 inch case so it could work easily in a standard M-98 length action.
Large Ring standard length (not M-48 Yugo) M-98s have a 1.410 diameter receiver ring, 8.750 in length, with screw spacing of 7.835. Barrel Shank of 1.100
The much less strong small ring Swedish m/96 actions are 1.30 in diameter are 8.50 in length, Straight side walled receiver with screw spacing of 7.620.
Small ring have a threaded shank diameter of .980 in.
So not only are the m/96 actions less strong,,,,, they are also shorter than desired for the 450 Marlin which has a 2.10 inch long case. Although you might be able to get away with it by loading it shorter than 3.00 inch COAL.
Folks who used to load the 458 2-inch liked to load the bullets way out for more powder room. You would be better off using aM-98 action..