Actually the thrust of two unaugmented Tu-160 engines would be almost perfectly in line with unaugmented F135s, and 30k pounds / 15 metric tons payload would be basically what the USAF is hinting at for B-21. I suspect the two machines will look very much alike, since the geometry of the original B-2 design (before the saw tooth, low altitude mod) is rather ideal for smallest number of reflecting angles and aerodynamic efficiency. I suspect H-20 will look exactly the same for the same reason. You only go cranked kite or something more complex shape wise if you are scaling smaller or going for superior kinetic performance. If you accept subsonic and bomber sized airframe as requirements, there isn't a better geometry for low RCS.
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