In Unreal Engine, finding the blueprint code changes manually is time consuming. Compared to text based programming languages like c++ , C# , unreal blueprint codes are not in text file when saved as a file. They are in binary format. Hopefully using “UE Diff tool” + version controll system, it is one click to find the code changes on a blueprint code or parameter changes withing version controll commits or any other files that are manually migrated into the project.
https://dev.epicgames.com/community/learning/tutorials/m6kL/epic-for-indies-how-to-find-blueprint-code-differences-using-version-control-system-in-unreal-engine