Yeah, the HD packs should work on newer versions of PCSX2. I personally stick with an older version because I prefer the way it handles texture dumping and texture replacements. I don't really like some of the changes to texture handling in the newer builds, so the older version works better for my workflow.
That being said, you definitely don't have to use the same PCSX2 version I use. Someone recently tested my Scarface: The World Is Yours HD Pack on PCSX2 Nightly v2.7.359 and recorded around 30 minutes of gameplay with it working:
So newer PCSX2 versions can work with the pack. I just can't personally guarantee every newer build because I develop and test my packs using the version of PCSX2 that I prefer.