Switch from Revo to GIAC

So… more and more it’s looking like I’m keeping my '14 S4 and as such considering moving on from the Revo tune I got a year or so ago to something with a little more potential. Aside from Revo obviously not being the “fastest” tune, they also don’t seem to be interested in updating or improving their tune for the B8- based on the website and FB their main efforts are in the Ford ST’s & VAG 2.0’s. It appears GIAC is the way to go for my B8.5 but what I’m wondering (and messaged GIAC about on AZ but haven’t heard back on yet) is can I keep my Revo pulley which I believe is virtually the same size as the AWE pulley and can I still use my Revo TCU tune, which honestly I’ve had no trouble with to this point. I assume I’ll get a reply at some point but wonder if anyone here has made this transition or has any thoughts about it otherwise.
Thanks