How can you compare/merge Visual Studio projects?

Question

visual studio

Good afternoon!
There are 2 projects on ASP MVC with the same subsystem for managing rights and users (the same View, Controllers, Models). There are differences in business logic, but in terms of user management, they intersect.
The user management subsystem is being finalized and can be used in other projects. I would like all changes to the user management subsystem to be made to other projects that use this subsystem.
Since this is an ASP MVC project, I cannot take it and just separate it into a separate dll, and then update the reference for projects using it.
I want to find a way to help compare 2 Visual Studio projects, find and see the differences, and migrate/revert the changes accordingly. There is something similar in 1C, where you can compare / merge 2 configurations.
Is there something similar in Visual Studio?

Answer 1

I am also a former co-player and also at first suffered from the lack of some features in VS.
Unfortunately, I did not find a built-in file-by-file comparison.
A handy tool for this is in EmEditor - quite intelligently compares two similar files and highlights the differences.