There’s no difference between MG and MG Pro. From what I’ve read and my experience, the MG seems to pair better with a dryer more neutral source so my personal pick of the amp would be the Little Labs Monotor. DAC probably sth like the Bifrost 2 as it retains the balance the best and it’s more relaxed than Ares II which may magnify the forwardness of the Monotor (assuming you’re allowing ~1k budget here from the mentioning of the Topping stack)
OH! Sorry, I misread the post as asking for the difference between the OG Clear and the MG! Yeah, ignore my post above. As mochimashu said, Focal claims the non-Pro and Pro are intended to sound the same, just different color and accessories.
The only thing that might be worth mentioning is that there seems to be some reports of QC issues (mentioned somewhere in the MG thread) on early batches of MG Pro (which was released prior to MG) so that might be a factor when buying a used pair.