Forgot to follow up to confirm this is the case ^. The arms of the door checks themselves are identical and have one side marked "L" and the other "R", so just assembled as mirrors.
I wasn't able to de-pin the lug off the end to reassemble/convert them with the tools and patience I had on hand that day, but I'm sure it's possible.
Here are a couple pictures of the RH check in the LH spot.