I don’t know how it happened, but the Play Store updated itself with a newer version that the one in Apps.
Here is what I get in the Apps screen:
version 33.9.15-21  [PR] 498467920
version 34.0.12-21  [PR] 500233025
Play Services, GSF and GmsCompat are not affected and are on par with the Apps repository.
How can I safely revert the Play Store version to the one in Apps? I saw another similar problem where it was recommended to uninstall and install again both Play Services and Play Store. However, is it not going to break the apps I have installed through the Play Store? Can I just modify the Play Store and leave the others untouched?