if I delete my previous iPhone’s iCloud backup, will all the date&info delete from my current iPhone? As i shared the account.

It is that i couldn’t backup my current iPhone as it showed that iCloud storage space is not enough.

I checked the storage and found that 3.8GB from 5GB was used from my previous iphone.

I wonder if I delete that Backups, will it delete the data&info I’m using with my current iPhone?

As I think the info is shared from the backups?

Or it’s downloaded to the new phone already?