Less or more a ridiculous discussion.
Both sides couldn't reach each other.
OK, they would start on one continent.
80% or more of all material which was produced on allied side in WWII was send to europe!
Army:
Both armys have had the best "common" soldiers in WWII (I think). The NCO's of the german army were the best of WWII. Both sides fight with the same modern tactics (speed, etc.). The japanese army was never build up to fight on a continent. They used bicycles in malysia! They have had only light tanks! They wouldn't have had the material and industrial power to win against germany. Germany would again (like in russia) start the war with 100.000 cars, trucks, tanks and so on. And with 10.000 different types, subtypes sub-subtypes and so on.
And with the same problems. The japanese army would be totally outnumbered. Two, three weeks, not more and...
And if the war would start 1944?
The german material predominance would be much more worse.
Airforce:
Both sides have had the best skilled pilots in WWII. Perhaps the german pilots were a little bit better. The japanese airforce would be outnumbered.
Most of the japanese aircrafts were unprotected. Less or more only some hits, perhaps even one everywhere and they didn't come back. No chance!
The ju87 as flying artillery...horror, pure horror.
Two to three weeks...
And if the war would start 1944?
The german predominance would be much more worse.
Navy:
1941, the german navy would be totally outnumbered, the DD where only ****, the light cruisers...Hmmm
And the rest?
Really good, but totally outnumbered!
No chance, especially against carrier-groups.
1941 germany didn't have enough submarines, the torpedos were...lets say bad or more worse.
1944 germany would have had enough "diving boats". This would be devastating for the japanese navy and merchant vessels, but they couldn't rescue the surface ships (even when they have all radar on board).
Whith enough XXI submarines...who knows...
2 to 1 for germany.
Armys win wars, airforces and navys support only.