What was the last big difference between versions we got in Pokemon?
Johto had completely different locations you had to go to to get Ho-Oh and Lugia.
Hoenn had the split between Magma and Aqua based on what game you picked.
Unova just flat out changed entire locations depending on what version you chose.
Is there anything really like that in Scarlet and Violet outside of Sada and Turo being swapped like the gym leaders in Sword and Shield?