I haven't been able to get hold of the correct person at Warners, but the reason for the titles is that these are the ones that ended up being owned by UK Warners after they bought out the EMI UK catalogue in the early 2010s. Basically the Roulette catalogue and the associated (ie bought up by Levy) labels, so Calla, Port, Colpix etc.
The two that were issued in 2019 came in the same packaging as all four are appearing in today.
I presume that they've got a plan, and if anyone tells me what it is I will post here.
Since the relaunch in 2017 there have been very few reissues, but they have included a Ray Charles Atlantic singles CD, and Nina Simone Colpix singles set, and the Candi Staton unreleased Fame tracks LP.