Well, they must be some vastly modified Dauphin's. I've never heard anything make a noise like a 365. You can feel the air vibrating for about 8 miles as its heading towards you and then the wailing banshee noise of that fenestron.
The 365 has a very distinct and impressive vibrating noise combined with the screaming sound of the Fenestron.
It seems that they are N3's so none of the above actually would be true. Fenestron on the N3 is same/similar to EC155.
Asymmetric spaced 10 blade composite fan.
I think the original fenestron may no longer be supported.