It's best to convert 3rd person games just based on 360 distances, this is my opinion and not based on anything. I actually tend to feel these days that 360 distance is best for hipfire period, regardless of FOV. Monitor Match is not reliable in 3rd person games except when your aiming/zooming in and even then it's not as good as matching first person games. Just use your 360 distance, it won't feel perfect, but at least your movement will feel close.