I have not weighed the old ones, but the new V2’s where Front 310g, rear 344g. According to Hope they are lighter then the M4’s if you have braided hoses on both, with standard hoses the M4’s should be a touch lighter.
The V2 rotors do weigh more, about 200g for the 203mm rotor and somewhere above 220g for the fixed one (which I have).
Note that quite a lot of hubs are incompatible with those floating rotors, hence I got the fixed ones.
Great brakes, best I had. Enough modulation to be killer trail brakes and enough power to handle any downhill conditions. Probably the most versatile brake on the market (though I have not tried close to all of them).
If you ask Hope for weights they will send you an excel with all their products on it. From what I measured everything was within a few grams of their claims so I would trust it to be pretty spot on. Only suspect thing was how much weight they claimed the braided hoses add, but again I did not measure them on their own.