Depends on which features exactly you are looking for. For searches, can use Content search, which is included in all the SKUs, as detailed for example here: https://learn.microsoft.com/en-us/office365/servicedescriptions/exchange-online-service-description/exchange-online-service-description
Same goes for in-Place eDiscovery holds, but those are now being deprecated.
In general, for any licensing questions regarding compliance functionalities, you can refer to: https://learn.microsoft.com/en-us/office365/servicedescriptions/microsoft-365-service-descriptions/microsoft-365-tenantlevel-services-licensing-guidance/microsoft-365-security-compliance-licensing-guidance