Just to be clear...
You have a Validation Rule called 'Project Deletion Only for Admin User' correct? And you want to change the scope to allow changes only to Project Managers and Managers instead of Admin users?
If this is the case then all you need to do is change the Evaluation criteria accordingly...
From: Not(CurrentUser().Admin)
To: CurrentUser() <> $ProjectManager || CurrentUser() <> $Manager
This should provide you what you need.
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