your best bet at knowing which ones have the latest revisions, or at least the glitches worked out.....unless they can show proof that the revisions were done....
for whirlpool, you want to look for model numbers ending in KQ2.....KQO was the first, second generation was KQ1.....
a little harder with the Kenmores to know which is which, unless you trace model/serial numbers for years of production.....but instead of the panel designs that are shown on these above, they changed the panel to a circular center touch pad for the cycles as the last/latest revision, and removed the word 'Calypso Wash Motion" from the control panel...
other than that, your taking chances unless proof is provided that the revisions were done....
both pumps are relatively quiet for either design.....almost silent.....
one other thing, if you, or anyone, has changed the boards, BOTH must be replaced at the same time if a glitch/virus is found....otherwise it will just transfer that back and forth....
about the only change in operation of cycles I have noticed so far, Normal cycle flips back and forth from nutate(agitation) to slow spin with the waterfall saturating the load.....the first series just rotated the load to saturate with the waterfall, then went into nutate from then on.....adding water through the detergent dispenser....
it also just dispenses water through the detergent dispenser for the first minutes to start the waterfall......then the water saturates the load from the fill flume at the 11 o' clock position until the pressure switch is satisfied...
just small changes from one machines functions to the next....
some people don't like them....I find them to be thorough at washing and rinsing....800rpm final spin...and almost fool proof to load and go!...
and your only washing in roughly 3 gallons of water per fill....