Hi @Louislu,
you can read more about databse patches here: https://docs.camunda.org/manual/7.13/update/patch-level/#database-patches
In the docs you can see that the two scripts adress the same issue. Release 7.11.8 overlaps with 712.1 and you only need to run one of the scripts.
Camunda didn’t offer scripts to rollback your database. The engine is able to run with a database version upgraded with one version: https://docs.camunda.org/manual/7.13/update/rolling-update/
To be safe, make a backup of your database.
Hope this helps, Ingo