Internet rumor is they come off the same line as the Abu Revo with lesser quality, but still metal, internals.
Depends on which Revo. I wouldn't say lesser quality but different materials.
One place to cut corners is in bearing count. Usually cut corners on the worm shaft and the knob bearings.
All of the Abus, Lews and PQs have three spool bearings, one mainshaft ball bearing, and the anti-reverse bearing. The lower end reels use brass gears and main shafts. As you go up in price they will add in bearings for the worm shaft and add bearings to the knobs. The main gear and mainshaft will be made from aluminum to save weight.
Seems to me they all use about the same SS bearings. The really high end reels use Magnesium frames. The lower end reels may use graphite frames.
Some have just a magnetic brake and some have both mag and centrifugal. Higher end reels may have just the centrifugal but with many more adjustments.
Some are Korean made some are Chinese made. The PQs are or were made in Korea. Low end Lews and ABUs are made in China.