The Nazi SS, Einsatzgruppen, Totenkopfverbande, and so forth were responsible for most of the WWII Nazi war crimes we know so much about. Likewise, the Kwantung Army's Unit 731 of the Empire of Japan was responsible for some pretty heinous war crimes as well.
What I am wondering is if these Japanese and German organizations collaborated on their human research and shared it with each other at all, or if they even drew any inspiration from one another. Any informative answers would be greatly appreciated!
No, or at least not to my knowledge. The Axis Pact was pretty much a hollow alliance and proved strategically worthless for Japan and Germany. Geographic distance and logistics were one major difficulty.
But you actually chose the wrong country. The more interesting and relevant country here is not Nazi Germany but the United States. After the war, the US military granted Unit 731 doctors immunity from war crimes prosecution in exchange for the biological and chemical warfare data extracted from human experimentation. So it was the US, not Germany, who ultimately benefited from Unit 731 research.