Sorry if I didn't explain myself well.
Grand Cherokee [ZJ] with built in Austria tag have to be changed to [ZG]
Grand Cherokee [WJ] with built in Austria tag have to be changed to [WG]
Grand Cherokee [WK] with built in Austria tag have to be changed to [WH]
Voyagers [RS] with built in Austria tag have to be changed to [RG]
1996-2000 Voyagers with built in Austria tag (many are code less, others have American code NS) have to be changed to [GS] (I'll comment on the few plated 2001 ones that aren't the new body)
Hope now it's clearer