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Thanks, fellows !
JimB; the terminology you used and I did not know: ISB helped greatly to confirm what I believed; as shown in Fig. 1 - B at ----> **broken link removed**
(ignore the Tx sections of the block diagram)
In short words takes two receivers, with different BFO frequencies.
I just ordered the assemblies to add a second identical VCO/PLL board and a second identical IF-product detector board to my HF rig.
In preliminary tests, I used a Kenwood R1000 in USB and a Kenwood TS440S in LSB, monitoring each audio output in the 2 channel oscilloscope in A-B mode when both tuned at the same supressed carrier.
Had to order the boards as the test receivers being slightly different, I got 10 µS delayed audio on the 440; yielding both audio signals not coincidental in time and I need them in phase.