No. Mobile saves use a different encryption. However, you can convert it using a "SA Save Editor" on PC first, then transfer the files.

CJ exhaled, hit quit, and for the first time in years let himself smile. He’d finished the run. The save files were here, stamped COMPLETE, but the streets would keep whispering. That was the point. Completion didn't mean surrender. It meant you had earned a moment to look back, count your wins, and get ready — because somewhere, someone would be loading their own save game and trying to take it all away.

Rename your existing save to something like GTASAsf1_MyBackup.b . This prevents you from losing your original campaign.

Don't let a difficult mission ruin your nostalgia trip. With this completed save file, you can skip the grind and get straight to the good stuff. Whether you want to fly a Hydra over the Vinewood sign, cause mayhem with a tank, or just cruise down the highway in a lowrider listening to K-DST, the world of San Andreas is yours to command.