Maybe also: Would the US have won against Germany if the USSR was not involved?
You're also changing the goalposts. We're talking about 1939, not 1941, which was after two years of herculean production.
https://defense.info/re-thinking-strategy/2018/10/oil-and-wa...
By 1939 Germany was at less than half of its peak, and only 24% (replaceable, 1936 composition) came from Romania+USSR.