Unfortunately, you only can have one company branding per tenant https://learn.microsoft.com/en-us/azure/active-directory/fundamentals/how-to-customize-branding
To achieve your goal, you must have each domain in one tenant.
Hope this helps!
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I have a domain where I have users go to login. At that Office365 login, the background is a picture. How do I change it for a different domain. When I added a domain, it defaults to the same picture.
Unfortunately, you only can have one company branding per tenant https://learn.microsoft.com/en-us/azure/active-directory/fundamentals/how-to-customize-branding
To achieve your goal, you must have each domain in one tenant.
Hope this helps!