Maybe. You can load a mp3 - tagged by "mp3 tag/studio" for "original, copyright" to "yes" - in Mp3tag. Then select this mp3 and press ALT + T to show the extended tags.
You should see the used tag for "original, copyright".
(If you can show us a screenshot from this extended tags window, we can tell you which tag you can use.)
If you use the same tag for your other mp3, you shoud be able to add this tag in Mp3tag too.