So, I've noticed that everyone can use all of the various transport turrets at full compatibility, except for the Bretonia Transport Turret, which has reduced power for nearly everyone besides Bretonians. This is not the case for the Liberty, Kusari, and Rheinland transport turrets. All of these turrets have the same stats, and are merely for visual effect.
This must be a fairly recent change, because I used to use these turrets on a lot of ships without technerf. It kind of sucks, because these are my favorite ones.
Crayter has a reduced compatibility with Bretonia Transport Turrets, which doesn't make a lot of sense to me, since they definitely work more with Bretonia than they do with Kusari or Rheinland.
The Core gets 100% power with Kusari and Rheinland turrets, but gets 90% with Bretonia and Liberty turrets, which doesn't make a lot of sense to me. I understand the 100% with Rheinland, but I would think that they should get 100% with Bretonia Transport Turrets as well.