The nock receiver dictates how the feathers are clocked in relation to the string groove. Back in the old days, there was only one indexer, the one we now call straight or standard. When the compounds came on the scene, fletching to cable clearance was an issue, so Bitz came up with the R & L indexers to tweak the helical feather position for better clearance.
Term, you may do fine with the setup you have, but I think you would like it better if they matched. Fletch up a couple and see how they look. I may have some extra R indexers, too.