No you can’t.
Search on community.
Why do you want to do that?
you can simply take all contents of the other screen and replace them with contents of screen 1
and do the same thing with screen 1
yes, you cannot remove screen 1as default screen and make other screen as default screen
You can simply set screen1 initialize block to open your preferred screen.
Don’t write your full question in the Title, As i saw in the body you only wrote
As said by @felixsarp
You Can Do This :
Ok yea you can also do that