Unable to open a project created with the launcher binaries in the same version of the engine with source code

Hello. I have a simple yet frustrating problem. I have a project created in 4.21.2 using the Epic Launcher version of the editor. If I am using the Epic Launcher version of the editor, I can open the project fine. However, If I launch the editor using the 4.21.2 source code build from github, it tells me the project was built in a different version of the engine. I tried downloading and compiling the 4.21.2 release tag as well, but I am getting the same issue. Any ideas?