Equivalent subscriptions refer to programs like Enterprise Mobility + Security (EMS) or Microsoft 365 Enterprise. There can be others, but these programs are the most common. The Microsoft Volume Licensing Product Terms refers to these programs as Management License Equivalent Licenses.
Configuration Manager is included in the following plans:
Intune user subscription license (USL)
EMS E3
EMS E5
Microsoft 365 E3
Microsoft 365 E5
Microsoft 365 F3 (formerly Microsoft 365 F1)
Important
Configuration Manager isn't included in the Microsoft 365 Business Premium plan.