sheracr123,
if you dont have any fishes in the tank
not to worry about the combatibility

(good thing)
about Mate Pair Clowns
You can ask the LFS to get you a pair but we do not know how old is Wild Cought Pair?
I mostly try to stay away from wild cought period.
You can try to pair them up your self
Maroon is the hardest clown to pair
ClarkII is the next one down the list (I failed)
The most easier pair clown fish is Percula
True Percula or Occelarus (False Percula) and you can cross pair these guy, I have successed making pair from a Percula and a Occelarus
And my stupidity is that I did not quarantine new fish, ICH outbreak and kill my pair (this is my lession learned) I sure have a Q tank now and will Q any new fish for 3 weeks
back to the question(I'm assume that you Q your fish)
if you want to pair Maroon CLown (I have not sucessed pairing clownfish with this procedure but it work for my other clown)
Add the Larger Clown to the desire tank wait few weeks, feed normally and happy
acquired a new clown smaller (maroon need to have at least 1/2 size smaller, easier to submit)
adde the new smaller fish in a clear container(or plastic bag) I prefer clear container with drilled holds allow water to move freely and place the container in the tank for couple days( I do it for 3 days, make sure you drill hole other wise the smaller fish will deplete oxygen in the container and die) feed normal to both fishes, you will notice the fish dance (I called fish dance because I have no better term to descripe it, you will see it) release the smaller clown to the tank and watch them closely
Alternatively, you can acquired any 2 juvinel clownfish, and they will pair as they grow.
I have a pair Cinamon Clown(purchase when they were just change to adulthood)
The method above I try with my Percula and Occelarus
Good luck