In that case I think it's still possible. This is getting beyond my scope of knowledge but I believe that even if an airfoil is the same the chord of the wing at any given location affects the stall due Reynolds numbers and who knows what else.

For example, if the root chord is 20" and has a 1" LE radius and the tip chord is 5" having a 1/4" LE radius I would think that even though the airfoils are the same that the air could more easily break away from the smaller radius LE at the tip. Maybe it doesn't work that way. I'm not sure.

I see what you're asking in your original question though. I've seen several heavy scale models roll over and die at low speed. Everyone calls it a tip stall, but it could just be that the whole wing stalled and it randomly fell one way or the other.

Just because a plane rolls over doesn't mean it was a tip stall.