Bulb replacement in a car 12V 60mA vs 14V 65mA
There are three concerns when replacing components like bulbs


Exceeding the power rating (Watts = Volts*Amps, the voltage and current going through the bulb) which could be a thermal problem and heat things up to much. If you use a lower wattage bulb, you should be fine.
Exceeding current, The driving circuit in most cases should be fine, but its a good idea to stay below the current of the original part, you'll want to stay in the same range. 
A bulb that is built for 14V says that because of the lifetime and/or brightness rating, that's what it was tested for. Since it draws about the same amount of current you should be fine. The bulb might be dimmer but it should be about the same or higher resistance.