Hello Karl,
yes I have them in both versions installed parallel on my system
The new installers for the airports (both version 2.0.0.0.) recognize p3 dv5 and you are prompted to add a folder name for installing the data files.
At PAFA I noticed, that the BWEP Floatsdock and medical station is not appearing. The two airports show sticked on top in the v5 addon list. I was wandering if this is the case, but not not the time yet to try fixing it.