My personal advice/outlook would be to focus on 1 of those 2 species, perhaps really focus on mulies and if time allows chase some antelope. You certainly can combo both, but to try to take 2 trophies, 1 of each species could be tough without luck.

It would be possible IMO to take hunt mulies and then just take any antelope...

or chase mulies and scout for antelope for a future hunt... next year etc...

best of luck regardless of what you choose to do!