Can you stack Game Pass from Xbox Rewards on-top of running subscription?

I just started a 3 month Game Pass subscription and I was wondering if I can exchange my saved Xbox Rewards points for a 1, or 3 month subscription and stack that on-top of my already running subscription. Will that work?

I ask this because some Game Pass codes are only for new members and cannot be used if you already have a Game Pass subscription.

Thanks for the help!