What kind of device are you using? The viscosity of the parrafin oil, and the interfacial tension between the dispersed and continuous phase will have an effect on droplet/particle synthesis. You might have to alter the properties of your continuous phase in order to achieve the desired result.
I think it will function in the same way but Viscosity of mineral oil and paraffin oil are different, so you have to apply high/low flow rates for the paraffin oil compare to mineral oil such that it will form the droplets/particle synthesis.