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This seems strange to me.
Have you put on weight?
What specifically is not comfortable?
My immediate thought is you might be better off going to a podiatrist and seeing if you need some innersoles to rotate or support your foot. It seems unlikely another brand in the same design will make much difference. You're not substantially changing the sole material, support or structure.
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Caveated with the fact that I'm very much not a sneakerhead but a) in my early 50s b) have owned the NBs you refer to I have found Reebok classics to be pretty close and might fit the bill with a wide range of options:
Can I get some suggestions for similar trainers to NB 574s/373 that aren't from New Balance?
Now getting to the acceptance that despite my feet not changing much and wearing them through most of my 20s that they're just not that comfortable for me anymore.
Pondering over a pair of Allbirds or something from Saucony - brands I've never worn before