Thanks guys. I used a different method to accomplish my goal.
I had a midi merge box purchased for a different setup no longer in use so by taking a midi out from my Novation SL keyboard, connecting that to the midi in on the midi merge box then connecting the 2 midi outs, 1 to the Audya and 1 to the SD90 I’m able to play both modules from one midi keyboard.

I usually only turn one of them on at any one time but it saves having to swap out cables plus I can mix and match between them if I want to.