I just checked mine but I'm only running them at 60% and the Mars is 83f on the bars and 110f on the driver. The spiderfarmer SE3000 are at 82f and 85f on the driver driver all set by eye and the dials at 60%
This is one way your lights are telling you one is better than the other and that being the hot running Mars.
The SF is likely older tech, is not using top shelf diodes, and doesn't quite pack the punch newer rail lights have under the hood.
Your Mars and my new AC infinity lights are nearly identical. 3 rails, same Samsung LM301H EVO LED (which are the top of the line horticultural diodes Samsung has to offer), same 4'x2' footprint.
Only differences are yours are listed at 320 watts and mine at 280 and the drivers on mine are not attached to the light so they can be mounted outside the grow space. Yours would cost me $245 while mine are discounted from $319 to $247 with a coupon code. Mine also came with the controller while yours would be an xtra $9.
The wattage difference could be from the different driver choices and I'd have to count diodes to see if ours have the same amount but by and large, identical.
It wouldn't surprise me at all if both our lights come from the same factory in China even though they're different brands.
I'm not sure what the individual watts are per diode but the heat starts there. The bigger the chip, the more heat. Coupled with undersized heat sinks and passive cooling, they run very hot and that's totally normal.
If the heat is too much of a problem you'll need to put fans on it to prevent heat build up. The light will still be hot to the touch but the air around it will be cooled down and then when there's an exhaust, the warm air can be removed and cool air added thru the intake to keep temps in check.
EDIT: Yes I dial down intensity in the final two weeks for resin. At harvest mine are only at 20%