Can delete this iPhone backup? icloud help.

Hello. I was wondering if you could help me. Before I did my transfer last night  from my 14 Pro to my 17 Pro I did a really good cleanup of my 14. Deleted a bunch of photos and text messages, etc. I got my iCloud storage down to 24 gb. I’m noticing after I transferred to the 17 Pro that icloud storage is now up to 34 GB. So that leads to a few questions.

1.) Could that extra 10 or 11 gigs because my old 14 pro is still being backed up in iCloud? See photo. 

2.) Now that I’ve transferred to the 17 pro can I erase the backup that says “Owen’s iPhone”…NOT the one that says “Owens iPhone “this phone”” which obviously is my new 17pro? 

3.) Last night it said “0gb” next to the 17pro and as you can see it now says 11gb. I’m assuming that means it’s backed up to iCloud now? 

4.) Will deleting the old iPhone back up lower my gb in iCloud storage?

Thank you for any help!!

[Edited by Moderator]