This is a tricky one. I have a .net framework 4.7.2 WPF project that references a .net standard 2.0 project.
They both have a reference to the Pdfium.Net.SDK package.
The WPF project use the PDF renderer.
The .net standard project is a shared project that does some low level PDF editing.
When the application is built, the WPF project takes precedence and copies over \.nuget\packages\pdfium.net.sdk\4.80.2704\lib\net472\Patagames.Pdf.dll, which is version 10.75.42.472.
Without any modification, there is a runtime error that version 10.75.42.2020 cannot be found.
If I add a binding redirect (oldVersion="0.0.0.0-10.75.42.2020" newVersion="10.75.42.472") to the app.config of the WPF project, it will work around the warnings.

I had to do this with the previous version as well and I'm just wondering if I'm doing something wrong here. I know it's not the ideal setup but we haven't had time to convert the UI projects to .net core (.Net) yet.

Here is an example of the build warnings:
Found conflicts between different versions of "Patagames.Pdf" that could not be resolved.
There was a conflict between "Patagames.Pdf, Version=10.75.42.472, Culture=neutral, PublicKeyToken=60fd6cf9b15941cf" and "Patagames.Pdf, Version=10.75.42.2020, Culture=neutral, PublicKeyToken=60fd6cf9b15941cf".
"Patagames.Pdf, Version=10.75.42.472, Culture=neutral, PublicKeyToken=60fd6cf9b15941cf" was chosen because it was primary and "Patagames.Pdf, Version=10.75.42.2020, Culture=neutral, PublicKeyToken=60fd6cf9b15941cf" was not.
References which depend on "Patagames.Pdf, Version=10.75.42.472, Culture=neutral, PublicKeyToken=60fd6cf9b15941cf" [C:\Users\bryan\.nuget\packages\pdfium.net.sdk\4.80.2704\lib\net472\Patagames.Pdf.dll].
C:\Users\bryan\.nuget\packages\pdfium.net.sdk\4.80.2704\lib\net472\Patagames.Pdf.dll
Project file item includes which caused reference "C:\Users\bryan\.nuget\packages\pdfium.net.sdk\4.80.2704\lib\net472\Patagames.Pdf.dll".
C:\Users\bryan\.nuget\packages\pdfium.net.sdk\4.80.2704\lib\net472\Patagames.Pdf.dll
References which depend on "Patagames.Pdf, Version=10.75.42.2020, Culture=neutral, PublicKeyToken=60fd6cf9b15941cf" [].
.....IO.Core\bin\Test\netstandard2.0\IO.Core.dll
Project file item includes which caused reference ".....IO.Core\bin\Test\netstandard2.0\IO.Core.dll".
.....IO.Core\bin\Test\netstandard2.0\IO.Core.dll
.....Azure.Core\bin\Test\netstandard2.0\Azure.Core.dll
.....BusinessLogic\bin\Test\BusinessLogic.dll
.....Settings\bin\Test\Settings.dll
.....ViewModels\bin\Debug\ViewModels.dll
.....WebApi.WebClient\bin\Debug\WebApi.Client.dll
C:\Users\bryan\.nuget\packages\pdfium.net.sdk\4.80.2704\lib\net472\Patagames.Pdf.WinForms.dll
Project file item includes which caused reference "C:\Users\bryan\.nuget\packages\pdfium.net.sdk\4.80.2704\lib\net472\Patagames.Pdf.WinForms.dll".
C:\Users\bryan\.nuget\packages\pdfium.net.sdk\4.80.2704\lib\net472\Patagames.Pdf.WinForms.dll
C:\Users\bryan\.nuget\packages\pdfium.net.sdk\4.80.2704\lib\net472\Patagames.Pdf.Wpf.dll
Project file item includes which caused reference "C:\Users\bryan\.nuget\packages\pdfium.net.sdk\4.80.2704\lib\net472\Patagames.Pdf.Wpf.dll".
C:\Users\bryan\.nuget\packages\pdfium.net.sdk\4.80.2704\lib\net472\Patagames.Pdf.Wpf.dll