Two Thermostats on a single zone
As others have commented:  The answer is yes.  The area will be heated until both thermostats turn off, and one area might be overheated.
A cleaner way to do this would be to buy a digital thermostat with a remote sensor (e.g. an ecobee) and have a schedule that either switches the driving input between the base and the remote sensor or averages them.   You can use heat correction factors to instruct the thermostat to do something like '70 in the living room or 65 in the entryway'.
Longer term, a fan, an extra zone, an extra space heater or a new loop may be necessary to get a more balanced temperature.