It’s a fair comparison. Frankly the Nazis are overrated.
Nazis: ~6 million
Soviet Union: ~20 million
China Cultural Revolution: ~30 million
Though the Soviet Union and China ones were more of a result of incredibly bad economic policies. The Soviets still killed ~1-2 million in Gulags directly.
Let’s also not forget the Japanese genocides against China. Nanjing, Unit 731…
There also is, of course, more recent ones that are little known. Cambodia took over a million and Rwanda close to that.
11 millions were killed, and 25 millions were starved to death by Soviets prior to the war. ("Svoboda" (Liberty, Ukrainian outlet in the USA) Oct 04 1941 [0]). Numbers are matching the (hidden and then destroyed) 1926 census, where Ukrainians were listed at 81 million and Russians at 77 million. Russians increased losses in WWWII from 12 to 42 millions to hide about 30 million of kills by Soviets.
At least the CPP and China only fucked their own people - plus, the numbers are hugely inflated BS as you note, adding results of bad policies, and famines etc in societies torn by wars and poverty. Regarding those, one could include the British genocide of Irish and Indian people which used those as explicit tools even (as opposed to mere incompetence, not to mention ruling India wasn't their job in the first place).
In contrast, imperialism and colonialism fucked people over all over the world. And some of the later impact is masked, because they enabled locals to do the dirty job for them - to the tunes of tens of millions affected.
After many revisions the total death toll at each of the concentration camps where the Holocaust occurred (which just so happened to only occur on ex-Soviet territory) adds up to a tiny fraction of 6 million, but the overall "6 million" Soviet propaganda term was never revised.
Comically absurd Soviet propaganda without actual evidence. As credible as anything published by the North Korean government. The winners of WW2 wrote the history books.
As far as the Holocaust goes, Hitler was inspired by America's white supremacy and genocide of native Americans, and the Holocaust was funded by numerous American companies (not just IBM.) So while Hitler and the Nazis definitely deserve the blame for that, the US' hands aren't entirely clean either.
