Is there a way to "Pass through" a MAC address on a Cisco Switch?

We have two systems connected together, and the end system (system 2) relies on differentiating packets via MAC address from system 1 (it has two routes).

For testing purposes, we want to put a Cisco switch in the middle. But doing so obviously changes the MAC address presented to system 2.

System 2 cannot be changed to RX a different MAC address.

Is there a way to "pass through" the MAC address on the switch from system 1 to 2, or is it possible to spoof the address on the port facing system 2?

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