In the Rugers revolvers, the .45 ACP, 10mm, 9x19mm, and .30 Carbine cylinders use the case mouth to headspace.
A .41 Magnum barrel would be ~.009" too large to give good accuracy with the 10mm or .40 S&W. On the other hand, Ruger made a special run of Blackhawks with separate cylinders for the 10mm and the .38-40 Winchester. A .40 S&W cylinder would be an another option for this setup.
If you _absolutely_ had to have a swapable spare cylinder for a .41 Magnum, the .41 Action Express would be the only suitable choice.