No mate you're not missing anything. The rocker covers are different apart from anything else..
And the "carbs" on my Norge look just a little bit different too !
Also, the stock Norge has a different timing cover (the one in the pic won't clear the 1200 Norge oil cooler hoses), an external oil cooler with hoses coming out the front of the spacer plate, and a completely different looking pan (no oil filter well). The one in the pic though DOES have dual plugs. So if it is a Norge mill, it's been dramatically altered to fit the Tonti frame.