Not to mention that Germany's total war economy drive in 1943 involved things like 1) stripping underutilized factories in occupied countries that were resource-starved from their machinery and tools, 2) targeted forced labour razzias in industrial areas in occupied countries to obtain capable metal workers etc, and 3) using concentration camp infrastructure to run factories (e.g. Neuengamme had 92 subcamps attached to factories, i.a. assembling military vehicles). That's a part of 'full mobilization potential' not considered for the Allies.