2 DLLs with different versions in different packages

I have two packages that share the same dll, but have two different versions. These dll's are System.Buffers, System.Memory, and System.Runtime.CompilerServices.Unsafe. I have tried using multiple solutions like deleting them from one package or the other, but it just ends up complaining about using that version. I have even messed around with the assembly definitions in multiple ways, but I've had absolutely no luck. I tried [this][1] solution, but it either just didn't work or I can't do it right. [1]: https://forum.unity.com/threads/multiple-dlls-with-same-name-from-packages.1042849/