It depends.Both rifles are good and strong ,but I have to think an overload in a Savage shooting smokeless would be potentially more devastating than one in a cartridge gun.There are more variables in the muzzleloader ie;breech plug tightness/condition, any gas cutting on the sealing shoulders,vent liner erosion etc.Plus if you overload a cartridge, you might notice the powder level is higher in the case than normal.Not gonna happen in a muzzleloader.With cartridge guns , if you reload, you have case length,headspace ,and metal fatigue issues, so it might be a wash.If you shoot black or substitute powders, a 5 grain variation in powder charges most likely wont get you into alot of trouble.Smokeless is another story entirely.
Shooting muzzleloaders is a hoot, but requires you to " unlearn" alot of things.Maintenence,loading,trajectories etc to name a few.It will absolutely make you a more detail oriented shooter and a more selective and disciplined hunter.Its funny when you shoot at a critter and miss and it stands there watching you reload and just as you're priming it splits...