In the UK, if you buy a blu-ray only disc, you get the new masters on that blu-ray.
in the US, if you buy a blu-ray only disc, you get the 2011 discs repackaged. The only way to get new masters on blu-ray in the US is to buy a 4K disc that comes with the new masters on the pack-in blu-ray.
It’s pretty much pot luck if you buy the single blu-rays in the UK. Amazon, you’re not guaranteed to get the 2020 version. At HMV, someone i know purchased the OT as separates. ANH was 2011, ESB was 2020, ROTJ was 2011. HMV refused to take the 2011 discs back as the package was opened. So he ordered ANH & ROTJ from Zavvi. Got ANH 2020 & ROTJ 2011. The packaging is identical too so there’s no way of knowing which version you will get even if you go into a shop and check the covers. So now he is stuck with 2 versions of ROTJ and no way of knowing if he buys another copy if it will be the new version or not. Until all the old stock of the September 2019 releases are sold, its a risk buying them as separates.
I’m surprised this hasn’t received more attention online - especially given the seemingly endless and inane ‘unboxing’ and ‘review’ channels out there on youtube.
This is discart for the September 2019 blu ray releases of the individual Star Wars films (the 2011 Special Edition version):-
This is discart for the August 2020 blu ray releases of the individual Star Wars films (the 2019 Special Edition / Maclunkey version):-
^ Nice of Lucasfilm to use the same art… if the Star Wars logo is at the top of the disc art it is the August 2020 release (the 2019 Special Edition / Maclunkey version).
Cover-wise…
The September 2019 blu ray release (the 2011 Special Edition version):-
The August 2020 blu ray release (the 2019 Special Edition / Maclunkey version):-
It is no wonder stores or warehouses are making mistakes and mixing up peoples’ orders - if they there are even aware there is a difference at all.
Just how lazy and cheap do Lucasfilm have to be with these releases… a cynic [cough] may go as far as saying it seems they are willfully confusing people as to the content of their releases.
There is a little more info on the September 2019 releases of the individual Star Wars blu rays for sale, here:-
The 2019 re-release of the Original Trilogy films on blu ray & DVD (2011 SE version)