I know this is an old post, but figured I would offer my experience.
I agree with Fourbore. You really must adjust the Ocular first. There are a couple reasons for this.
1: The ocular adjustment serves no other purpose than to adjust the reticle to your eye. This being different for every person's vision. Has nothing to do with the construction of the optic.
2: After focusing the reticle to your personal setting then the parallax can be adjusted. Here is why. If the reticle is not focused for your eye in the first place, then the parallax adjustment may be in vain. If you don't have a focused reticle then the parallax problem isn't your biggest problem.
3: The need for Ocular focus is caused by the individual not the optic. The need for parallax adjustment is internal to the optic.
Also, I feel like Parallax isn't that big of a problem at longer ranges. It is a far more realized problem at closer range. Like 25 yards or less.
All that being said. No, Adjustment to the ocular lense will not impact the optics parallax setting. This is because Ocular focus is an external factor. Parallax is an internal factor to the optic. However, if the reticle is not focused to you personally. Then your parallax adjustment will likely be for naught.