I will repost my comments from this, posted on this exact topic in the What-If section.
"When the war ended, Germany had not even managed to make a sustainable reaction, and their plans for a reactor were not only non-functional, they were idiotic. The US had created its first sustainable reaction on December 2, 1942 at the University of Chicago. German technology was not only hopelessly behind, but their theoretical and practical models were entirely wrong. Had the Germans attempted to create a sustained reaction, they would have cascaded and irradiated the lab, likely killing its occupants. (The German ‘control’ process involved throwing lumps of coal into the reaction chamber)
As for extra Uranium, the Germans had a pitifully small amount of Uranium; in fact the reason they had not yet attempted a sustained reaction was a lack of fissile materiel. They DID have a great deal of unprocessed Uranium Ore, but firstly most of this was taken by the Soviets, and secondly the US had more Uranium or than it could use, processing it into fissile materiel was the hard part.
The failed German atomic bomb project data contributed not at all to the Manhattan project. It was not only three years behind, but in many cases completely wrong."
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