Can two accounts in different countries share storage?

I have separate iCloud accounts in the US, where I used to live, and in the U.K., where I live now.

Currently I pay 79p monthly for 50 GB storage for my U.K. iCloud.

I recently logged into my US account and shortly afterwards received an email from Apple telling me my iCloud storage was almost full. When I checked, I only have the free 5 GB in that account. I have plenty of storage left in my U.K. account.

Is it possible to consolidate the storage so I can use what I pay for in the U.K. to also store the US items or do need to buy additional storage for the US?

Thanks for all replies.