It's more difficult than that.
Just having QD scope mounts doesn't mean you can switch scopes from one rifle to the other. The Zero for the second rifle would be far off.
For the purposes of barrel comparison, and truly being curious about the accuracy of both barrels, it might be worth it to zero on one, re-zero for the second, and re-zero back to the original. Just to let somebody else know - it really wouldn't be worth it.
This would be where you, OP, buy two barrels, a scope, and a good QD scope mount, and go through that process. At the end of that process, you put those results up here.