For historical reasons, we got the below 2 compatibility-related scripts in our codebase (the "test/evergreen" folder). The 1st script includes various types of compatibility tests across MongoDB & standalone releases, and the 2nd script only covers compatibility tests for one special type "import". 

• compatibility_test_for_releases.sh
• import_compatibility_test.sh

Lots of the code in the 2nd script was actually borrowed from the 1st script and becomes a maintenance overhead. We should consider merging the 2nd script into the main/1st script, and use a special command option to trigger it.