What is the stop difference between digital and slid film?

There is no stop difference between a meter reading from a film camera, and that of a digital camera besides the ISO. If you will be using your digital camera to take meter readings, ensure the ISO on your G10 is the same value of the film you are using - i.e., if you are using ISO 400 film, you need to set the meters of both cameras for ISO 400 for the correct exposure.