Import functionality updates translation even if newer version exists on target

Description

Steps to reproduce

1. Create a content page with master language “English" and a “Finnish” language branch.
2. Export that page using the Admin/Export Data functionality.
3. Update both the English and Finnish language versions and publish them.
4. Import the file exported in step 2. Make sure that “Update existing content items with matching ID” is checked.

Expected
The import should not replace the updated content pages. Both master and language branches should behave in the same way.

Actual
The Finnish version is always overwritten with the version from the imported file. However, this does not happen with the English master branch if the content was updated after it was exported.