They are very similar but they are sure not the same! EverGrow does make ReefBreeders, OceanRevive and one other brand, but I don't think they make MarsAqua.
I haven't had the opportunity to inspect a MarsAqua close up so I can't comment on what's inside in terms of heat sinks or fan quality. But almost every other inexpensive Chinese made led fixture, even those made by companies other than EverGrow, run 3 watt Bridgelux/Epistar leds at 2.2 watts per led. For some reason MarsAqua is running the same leds at 1.8 to 1.9 watts per led. It's not a huge difference, but my guess is the PAR of a MarsAqua will be 15% lower than the others at the water surface and maybe as much as 20% to 25% lower at 24" deep in a tank. Now I run my led fixtures at 90% to 100% power on the blue channel and I wouldn't like to see the PAR reduced by 20% or more just because they want to run them at lower power (maybe cheaper drivers?). :debi: