If you are going to buy the blu-rays, you HAVE to buy them as a box set or with the 4k separate versions. If you buy the blu-rays individually, then you end up getting the 2011 versions you already have. If you are going to upgrade to 4k in the future then just go for the 4k versions now, because they include the 2020 versions of the OT and you won’t have to double dip in the future once you upgrade
I thought the separate BDs recently made available on Amazon and HMV were the 2020 versions, e.g. https://www.amazon.co.uk/gp/product/B08D723MD6/ref=ox_sc_act_title_1?smid=A3P5ROKL5A1OLE&psc=1
(Sorry, probably should have said I’m in the UK)
If you buy blu-ray only you are going to receive the 2011 masters.