The conversion tables from Nitro/gas to electric are not exactly precise. They are general ballpark conversions. It is easier to just get the weight of the plane and start from scratch.

Everything in terms of Electric Power is based on total watts and watts per pound of aircraft. Here are some general numbers to look at for Electric Power based on the desired performance of the aircraft - 80 watts per pound for a trainer - 120 watts per pound for aerobatic - 150+ for 3D and unlimited performance.

Say you have a 3lb. plane that is an aerobatic model. The first step is to figure out how many total watts of power you are going to need. So take the 3.0lbs and multiply by 120watts per pound for aerobatic = 360 total watts required. That is just step one, but it will help you pick a motor and battery combo. that can deliver the required power. One step at a time so it does not seem overwhelming

Is the 1320grams an all up flying weight with everything included for an electric version?