Asked to change project to different version.

Hi there, I have made a project in UE version 5.2.1 a month ago from the launcher version. Now I built the same version from the source.
When I open the project in the source build of UE 5.2.1 it asks me to update project files to that version, even though it says its the same as the launcher one. Why can I not simply open it with both versions on need?
It makes it quite difficult to work on the dedicated server and have other team-members work on content.

What can I do? Or is everybody in the team requires to also use the source build now?

Best wishes and thanks in advance