There are 3 places to check for the version of your Kentico install:
- File system
- Kentico UI
Check this answer out for more details.
Another option we typically do is adjust the version of the imported object. You can do this by unzipping the .zip file you downloaded and in the cms_info.xml.export file look for the node:
Modify the value to 0, save it, add it back to the .zip file then attempt your import again.
So maybe the problem isn't with the target server you're importing into, but the source server where you exported these files from. Either way if they are supposed to be a mirror of each other, you have something wrong or should be reviewing that a bit closer.