Using a Convection oven. Do I use the same temperature as a Fan oven?
The temperature of the food raises faster in case of the oven with a fan, so you have to set a higher temperature in a conventional oven than a fan (Convection) oven. 
It is not possible to have any conversion chart as between them, because how fast the temperature of food raises depends on the food itself. So, some experienced has to be gained while using conventional(without fan) oven keeping in mind the first point I mentioned- "In most of the cases, temperature you have to set this time will be higher than an oven with a fan".