majkimajki is the destination forum brand new? Is this a one-time thing or will you perform it multiple times?
If the tags contain no discussions, it should be safe to create a database data-only dump of the tags table in the source and import it in the destination, as long as the tag IDs don't exist there already.
If the tags contain discussions, you will have to reset the meta columns manually or the destination forum will incorrectly show that the tag contain discussions, and might try to load the last active discussion for each tag which won't exist (set the _count and _id columns to NULL).
The tag-specific permissions are stored in a different table and it's a bit more complicated to copy them.
