Sending, receiving, and organizing email in Outlook.com
Hello,
No, they are not the same. They are being treated as two different email addresses.
If you want to be able to receive email on the outlook.com address too, you need to add it as an alias to your Msft account, assuming this username is not taken by other users yet.
Sign into your personal account via this link: https://account.live.com
Go to Your Info > Sign in preference, Add an alias.
Create new: this will allow you to use the native domain outlook.com to create it.