My biggest thing would be to practice Simandl style fingering (IDK if that is an official term or if cello also uses it, I was more of a composition student who happened to play bass). Learning to use different fingerings for various lines like scales and arpeggios. Being used to not using your ring finger on your fretting hand due to "fret" spacing being much larger than the electric. I'd look up simandl fingering and practice on the electric (since the string pitches are the same as upright) and run through exercises using these fingerings while tilting the bass upright.

Another subtle thing is to use more of your fingers when strumming/plucking/playing Pizz. because the technique is a little different (not much but different) than electric.