I've moved from one to the other before, but it was always host side and the zoning that was "fun" to deal with during the migration.
With this though, all the zoning/configs are in the RCF files. I don't think it would matter (someone can chime in here if i'm missing something) The steps would be the same. You're disabling one fabric at a time and then brining it up on new switches. i can't find that specific doc though, i'll keep looking around though.
Lastly, I would make sure that the optics are compatible going to the new gen switch as well as verify with the IMT.