Assume a client calls an asynchronous RPC to a server, and subsequently waits until the server returns a result using another asynchronous RPC. Is this approach the same as letting the client execute a normal RPC

This approach is not the same as letting the client execute a normal RPC

Explanation:

This approach is not the same as letting the client execute a normal RPC and this is because an asynchronous RPC sends an additional message across the network after the initial call/message is sent by the sender to the client. this additional message sent through the network is directed towards the sender of the initial call/message as an acknowledgement of the receipt of the initial message by the client .

synchronous RPC is made of two asychronous RPCs, hence the client executing a normal RPC  will not establish a reliable communication between the client and the sender as asynchronous RPC would