(EZ) convert an A4 drum into an A3 drum?

Hi everyone, I’m working with a Riso EZ series machine and i could get a used A4 drum.

1. Is it possible to convert an A4 drum into an A3 drum? Specifically, can I swap the screen and to make it an A3, or is the physical cylinder size strictly limited to A4?
2. Would it still be possible for me to print A4-sized pages on my EZ A3?

Thanks !