I believe if you compare the geo chart, the old AL XL is bigger than a size 4 Revved. Post up in the GG forum or the Facebook page and you'll get a definitive answer.
Or call, the shop, they are always up to answer any questions and I believe they have a few trees working there as well, so they'd be a good resource. I'm 6'4" and I am on a XL AL frame and love it