Applying HRMS 9.1 Bundles after Tax updates

Hello,

  We have been keeping current on the Tax updates, but not the HRMS bundles. Now because of Affordable Care Act requirements, we need to get current on the bundles by applying bundles 9-18, plus the common objects updates 5-10. My question is, can we go ahead and do that, or will it mess up changes that were made by the tax updates? Are they mutually exclusive? Or is there a potential for them modifying the same objects?

Also, I was thinking of applying all of the hrms/common object bundles in demo and then comparing/applying to our devl environment one at a time. I know the best way is to apply them one at a time, testing in between, but we just don't have time for that. Has anyone done it this way?