Is the new portal the same site my institution uses to access PSAT-related assessment and SAT score reports?

No. The AP Higher Ed Score Reports portal is a different site, and access will be granted separately.

If you already have a College Board professional account to manage PSAT-related assessment or SAT score reports or other College Board services, you’ll be able to use the same account. You do not need to create a new account.

However, your account will need to be granted access specifically for AP score reports.