Indeed, as we have different camera set-up, we probably different options in post-processing.
You probably suffer from the lower dynamic range of the EOS 5D Mark IV vs. the Nikon D7500, which impact the ability to push the details in dark areas. DPReview test is quite useful to see the difference:
If you compare with the D850, which would be the Nikon equivalent range, the difference is even more significant. You can almost push the D850 to +6EV with an acceptable level of noise.
Dehaze darken the image, which means that you need to push the exposure to compensate. The dynamic range of the camera will impact how much you can do that. It is a camera feature which is often overlooked, but which is quite important for underwater photography, as we have many situations where we need to do post-processing to compensate the issues create by shooting underwater.
During my last trip, we dived with whale sharks water rich in particules, and I would of push Dehaze to +20-40 when processing these images.