I would not count on that, unless you are one of those people who claim they can hear the difference between a class A/B power amp and a class D. The HD350 (and the Gorm variant) have old-school "lead sled" class A/B power stages. The Reidmars are class D, much lighter and much cheaper (and made in China), but have pretty much the same pre-amp front end as the HD350. Indeed, the Reidmar 750 looks to have *exactly* the same front-end, including both the compressor and the Drive circuit, while the Reidmar 500 seems to have exactly the same front-end as my Drome - same as the HD350 minus the Drive circuit. They finally came out with a 2-ohm-compatible version of the 500, but as that's less power than my HD350, I'm holding out for the 2-ohm version of the 750.
The Reidmar and HD350 do not sound the same, neither in preamp, nor the power amp.