The one with the mohawk is essentially the same machine as the blue one you posted. The belt cover was sold with the DP and I believe it was also sold as an accessory option. (but I haven't had the time to look into that)
Both were made by Atlas for Sears. That is why you're getting similar results to your blue DP when you search for the model number. I'm not sure (I haven't been able to pin it down), but I think that these are both Atlas model 74's with slight variations for Sears. Sears would assign a different model number with each variation of theirs, even though the DP's are essentially the same machine.
BTW - The closest match to the old Craftsman blue that I've found is Valspar #85205 Classic Royal Blue. It's a little brighter than the faded color on the old machines, but it blends in well.