I found the orange followers have shorter front legs than the black followers. There is about a 1/4" difference in length. I'm not sure if that will allow an additional round or not. I would think that both legs would have to be shorter to allow the room for an additional round. I'll do a little experimenting.
Here is a pic of the two side by side.
Early 1990's black follower and a current orange follower. The orange follower is being propped up with a .22 case.