There is a nauticam to marelux port adapter, but I'm only using a flat port with a WWL, so I have no experience with it. The port opening on the Marelux is HUGE (no need to mount lenses after putting the camera in the housing, everything will fit though), so direct fitting of any other ports won't work.
The bayonet mount for the WWL fits with no problems. I was told by Bluewater Photo that I would need the older screw on type, because the bayonet wouldn't work. That turned out to not be true at all.
The interesting thing with Marelux currently is they are being pretty innovative in other areas, lighting in particular. Housings are housings, as long as everything works. I've had issues with Aquatica triggers, and the deep springs are no fun when shallow. The only slight pain for the a7iv housing is the camera/video/S&Q selector. It's a wheel under a wheel, so the housing engineering is a little complicated and can be easy to get wrong during set up. I'm interested to see how Nauticam did it.