Changing domain name or moving existing tore to new my.shopify account

Hello-

Is this possible:
I have an existing store set up at domain (example) abcd.com with shopify URL abcd.myshopify.com.
I understand that I can change my domain name - but not my shopify Url (abcd.myshopify.com).

If I create a new account with the updated example wxyz.myshopify.com, and wxyz.com domain. Can I somehow easily migrate all of my theme, products and store contents to my new shopify account?

Of conversely, are there long-term implications for a domain name/shopify URL name mismatch, if I just change my domain name (wxyz.com domain), with the unmatching abcd.myshopify.com.

Thaank you!

I guess you can add a third party Domain…see the link if it helps

https://www.youtube.com/watch?v=noJ-Sl1cQG4&ab_channel=ShopifyHelpCenter