yes it is not the Buele of the typcial G-6 series if you look. The angled arched plate is a photo indication of the AS and 605D engines. As I just said the present piocs from JY Lorant shows this to be true.
The bulge on the G-5, G-6, G-14 was for the mg 131's. The more streamlined engine cowling was large enough to house the newer more powerful AS type engines pl;us the addition of the enlarged oil cooler...