Exact same gearbox plate--even lever position referencing. Exact same speed selections. Exact same proportions (i.e. relatively smaller carriage, handwheels, etc.). Exact same carriage control lever positions and design. Exact same top slide design. Very close to the exact same weight (SB is heavier).
So basically, without any further literature to reference, I will judge this machine on the merits of the EMCO Super 11. That isn't a bad thing. It also means the "low thread count" (focusing on metric here) only represents stock gearing. The EMCO could generate a much wider selection with the substitution of a couple gears on the banjo. The SB also adds 3/16" to the spindle bore.
Would a brand new Super 11 for $7.5k tempt you? I've seen them sell used on PM for as much. Unfortunately, the largest hurdle toward objective judgement is going to be the name. IMO preconceived expectations, historical authenticity and aesthetic originality have a tendency to bias reactions. I'll admit to having taken a while to look at it with a blank slate myself. I really can't be precise in what I was expecting, but the few years' wait certainly raised the stakes. That's a hard benchmark to hit---maybe impossible, as shown by the reaction to the "new" 10K. Then there is the lighting-rod of ethical viewpoints on so closely "copying" a known design---especially when manufactured in Asia.
My end conclusion is that, unlike the OP, I'm not disappointed. The "new" Heavy 10 is clearly differentiated in features and mechanical design from the "new" 10K. The only pause I give is if the same spindle nose fitting could have been retained across the models; however, looking larger to the Heavy 13's, there is compatibility there. That is probably a better business decision, though. A larger work, commercial shop may cross over to buy a smaller, lighter machine for secondary work more readily than a shop focusing on smaller work. Or a hobbyist buy multiple, different models with the same nominal swing. And D1-4 is far and away more common among the two.