Wordpress login

A basic question but can’t find an answer anywhere!
I have successfuly migrated my website to dreamhost using the wordpress plug-in but I’m confused by the email I recieved from dreamhost with new log in details.
Do I need to use a new wordpress login to access the dashboard? I can log in with my existing details and wordpress didn’t recognise the username dreamhost gave me anyway!

For any other newbies to migrating hosts, I contacted support and they confirmed you do use the same log in details for an existing wordpress website that you’ve moved. The email you get from Dreamhost is confusing as it seems to imply you need to log in with new details but that would be for a new website.