Splash screen on a game made with pro and modified with free.

Hey! I know, if I make a game with the pro version of Unity, I can personalize my splash screen and if I make it with the free one, I cannot.

My question is, if I have a game (source code) made with the pro version (let´s say I buyed it) and I want to modify some things, like a graphic or a music; once I do it and save the changes, will that splash screen change from the personalized one to the free one or it will remain with the original splash screen?

In one word: I have a pro version game, I change something in the code with the free version. What splash will I have?

Thanks!