2 Marathons 3 Weeks apart

I was lucky to get through the lottery for Berlin & Chicago 2025. Both Marathons are three weeks apart. Do you think it’s doable?

Berlin would be my 1st Marathon, Chicago my 2nd. I don’t care about my time finish and pr. I just want to enjoy it as much as possible. I have run 3 halfs before and my next half marathon race is in April.

Also I read (Chicago Marathon page) that I can defer my application for Chicago 2025 but will have a guaranteed entry for Chicago 2026. Has anyone experience with this case?