Deleting the game I don't think deletes save data. Esp not the case on PS4. My PS4s pitiful 500GB HDD runs low all the time with me so always deleting games. Since PS4 just added External HDD support plan to buy one soon. Whatever is on your Vita card you can put in another vita and carry on like nothing has changes. Only the model 2 Vita has 1GB of internal storage so maybe settings there would be different.
I have on PS4 digital versions of games but deleted it when I got a physical like Rocket League. My save data is intact. The Save data will be there physical or digital copy. The save data recognizes the game not the format and pretty sure it's the same for Vita.







