You can use the pinky, especially if it feels comfortable to you. What must be kept in mind though is that the pinky could attract a lot of attention, but you say it looks the same, so I see no need to change.
I personaly cant notice any difference, because the way he teaches it the pinky is in the same place but its not touching the card. Does anyone have any thoughts on this? Because as i said i personaly think it looks the same but i might be wrong.