My theory is that later V1s have the same sensor as the new V2. I called then the V 1.5's because the firmware was updated and the image was significantly better/more sensitive than the first release units (enough so that the hardware had to be changed as well). I don't think these are going to be upgrades to the later produced V1's. The USB C is a downgrade in durability compared to the Fischer port.
For reference to the new units, here's a picture from a later RH 25 V1 (the one with upgraded firmware and potentially sensor). The image from the later V1s kept up with the voodoo S.
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