@ashel90
Yes, it is.
Just match the terminal labels on the original thermostat to the label on the Nest. You can ignore the jumper between RC and RH, as the thermostat will internally make the connection if one is needed.
The Learning Thermostat can operate just fine without a C wire, but I always recommend installing one. You can use a spare wire if there is one or use the Nest Power Connector.
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