Can I access the disc version on Gta5 if I delete the disc version on Ps4 and then play the digital version soon?

I have the following problem: I have gta 5 on CD and have already spent a few hours playing there. Now I have forgotten the game with a friend I will not see again in 5 months. I bought the digital version because I did not want to give up Gta for so long. However, I have to delete the CD version to use the digital version. Now my question: if I now delete the CD version and then the digital games, but then later have the CD version and delete the digital version again, then I still have the old game version of the CD version before I the digital version played?

You should still be able to use the game version of the disc version with the digital version, unless you have deleted it.

Why do you buy the game again if he could just send it to you by mail?

Some people just have enough money.