Wouldn't the version number be point incremented for the ones that
supposedly are less of a nuisance to astronomers, which I thought
these were or...?
Oh - mostly not.
It's quite likely there's internal difference and revision numbers
we're not aware of, it's not like SpaceX is obligate to provide this.
We only have the basics based on various tweets (mostly by Musk) and
official statements during launches and in other media.
The "reduced nuisance" satellites is not in general deployment yet,
just two single-satellite trials. IE, one of the satellites in the
Starlink-6 launch was named "DarkSat" and one in the Starlink-7 (the
most recent one) was named "VisorSat" though they're ALSO making
software changes to try to mitigate (orientation matters a lot!).
With the current schedule they likely already have at least two full
batches of the current design already built (60+60 for Starlink-8 & 9
launches) and it's likely they'll keep using the "known working" model
while they do more tests to refine the final solution, IE by inserting
single one-off satellites in launches where the rest are regular
Heck, there may well have been many other one-off satellites hidden in
the existing launches that we don't know of because they didn't test
this specific area where SpaceX has been very open about what they're
Musk has tweeted that their goal is to launch satellites with laser
links between satellites "late 2020", I would expect those to include
various enhancement in this area too.
Given that it's SpaceX and they really believe in rapid turn-around
there MAY be a general deployment of some intermediate version before
these earlier in 2020, or not. I think that depends on how comfortable
they feel with it and how far ahead of the launches the assembly line
Musk seemed to be very confident in the VisorSat concept so it's
definitely not impossible there might be an intermediate version if
the test works well. The problem is worst during the early after each
launch so at least they get data early rather than having to wait 2
months for the orbit raising to finish...