Types(CPU/RAM type) of IaaS required for for replicas and primary node in a SQL AG?

Types(CPU/RAM type) of IaaS required for for replicas and primary node in a SQL AG?

For Basic SQL AG for SQL 2016 Standard version, the replica node (can be a less powerful IaaS- less CPU/RAM)?

For SQL AG for SQL 2016 Data Center version, can the replica nodes be less powerful the primary node within the same data center (zone)?   

If we use a distributed AG with SQL 2016 Data Center version, can the replicas be less powerful for the fowarder node at the DR site?   Can the other replicas both at the primary replicas in the primary data center and be less powerful (less RAM/CPU) than the primary node?

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