/diy/ - Do It Yourself

Hello, I have a few questions about varistors. My friend has a 110VAC camping trailer heater that he applied 220VAC to, this fried a varistor on his heaters board. I want to replace the varistor (on the left), but all I can find in my scrap electronics is one with the same voltage rating, but a smaller diameter (on the right). I understand the capacitance of the varistors increases with the diameter, but I do not know how a smaller capacitance will affect the circuit.
My questions are will the lower capacitance varistor work in place of the larger one? Does the lower capacitance mean it will blow faster, or at a lower voltage?