Yep, those are the ones.
That tank on the Desmo may be a re-paint. Both of mine had chrome thigh panels and candy style paint, the 350 was candy electric blue and the 450 was candy apple red. Leaks were a common problem with those tanks. Likely because of the chrome plating but also because of those long straight panels on both the inside and the outside of the rear section of the tank, they resonated and cracked at the seam at the bottom rear, near the petcocks. Brazing/welding gas tanks of course is problematic. I tried tank sealant and it kinda worked. The thighs of my jeans would smell of gasoline - not a hit with the fairer sex! The other problem with welding those tanks is that the chrome would blue/blacken and then you're gonna chrome it again ? ! ? and make that steel even more brittle and weak ?- so that's why you see silver painted tanks, the paint on the silver thigh panel portion is covering up the burnt/blued chrome in the vicinity of the crack repair.
The tank on that Diana is the smaller, standard one, of course, same goes for the headlight. Mine had the Veglia tach with tach drive of course. There was a number plate that came with the bike too.
In 1979, I sold the two Desmos and a pickup truck bed full of Ducati parts to an Australian to help pay for school.
In 1983, after two years of lane splitting on it down the Hollywood freeway to get to school, I sold the Diana in 1983 to pay to finish school; a Japanese gent took it to Japan.