I mean update the map and delete one, cause' I thought that I will update it if I will upload her again, but now I need to update 1 map and delete other.
you have to wait for a map to go to the graveyard, and delete it from the map's page on the website. A map graveyards after a set amount of time without being updated, I believe 30 days, but I could have that time wrong.
One thing you can do is grab a new audio.mp3 file and drag it into the osu! song folder for that specific map, then the next time you upload/save it, the audio will be new.