Hi there, @Annde!
You can have the same login credentials with two different countries of your QuickBooks account. I'm here to help you accomplish this.
To start with, you'll have to select your preferred country supported by QuickBooks. From there, you can purchase a new company subscription and enter your login credentials.
In addition, QuickBooks will automatically recognize your account so you can have one login credentials for your accounts.
That being said, you can follow the detailed steps outlined in this article so you can successfully create your new company subscription: Create or Add Another Company.
As always, you can visit our Helpful Articles page for QuickBooks Online so you can read and learn some steps of your "How do I" questions.
It'll be always my pleasure to help if you have any other questions. I'll be keeping an eye for your response.