Johnny, you are correct. You can use tab written for C-tuned ukes with your G-tuned baritone and you will just be playing in a different key. Just watch for whether it's high G or low. Most tab is high G, reentrant tuning. I'm guessing your baritone probably has a low D, linear tuning. So, look for low g arrangements if you can or you'll have to find the notes that fall on your d string elsewhere on the fretboard, or they can sound funny.
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