It's not a question of balance. Indexing is a concern if there is runout at the yoke or pinion flange. Think of a small wobble, in the degree of thousands of an inch. In that case, you are trying to match the high spot on the yoke with the low spot on the flange (or vice versa) to eliminate it as much as possible. If needed, the factory would have done this already, which is why it's usually recommended to mark and reinstall as it was.
But, if there is no runout, it won't matter how it's reinstalled. I'll bet that is the case for you.
Worst case, if you end up with a vibration, keep rotating the position until the vibration goes away. Not a big deal.