All these series should be more or less the same.
BSH (parent company of Bosch) phased out all but one base design.
All have a single inverter on the main board, driving both the wash and drain pump via a switch over relay.
All have the same flow through heater.
The big difference are between the filters - which don't impact performance much as it's just a tiny design difference - and that some markets can get machines without diverter.
The machines without diverter don't have a top spray, only the 2 spray arms, so they are easy to spot. I would generally avoid those.
The higher tier machines usually are quieter, have more cycles and options etc.
There might still be machines with a plastic base tub - those are know as a failure point with leaking where the 2 parts are joined.
Drying technology is another big differentiator.
Some just have static dry, some have AutoOpen style drying and some have CrystalDry. The EU can get the latter 2 combined, not sure about the US.
CrystalDry is just amazing, period.
Racking is different from machine to machine aswell.
Base is the same, most that changes is type of third rack and how much is foldable, plus soft touch points in some machines.
Last thing is that now, there are a few select models with motor driven lower spray arms.
That design is extremely new, so no word on any issues yet.
If I would give any recommendations, CrystalDry is the way to go.
It makes the one big repair all of these will need after 8-15 years a decent bit more involved (pump replacement), but there is just nothing like it drying wise.