Access Enforcer CC and FF

Hello,

We are implementing new ECC 6.0 on AIX and would want to implement AE, FF and CC as well. Also we have old AE 3.0 .NET version and CC 4.0 and FF 3.0 on 46C. We will be doing a data migration after implementation. My question is what version of AE is compatible with our current CC and FF. I checked PAM and found that I have to go on to the latest 5.2 suite for all the three products on AIX; is this true? Can I not just use AE 5.2 and still remain on CC 4.0 and FF 3.0?