There are many who post to this forum who know far more than I do but my understanding from TPG:
https://thepointsguy.com/news/delta-...ng-737-cabins/
is that both the 73J (with one row of C+) and the 73R (with four rows of C+) are ex-LionAir. I realize that TPG isn't necessarily a reliable source of information so I welcome corrections from people who, unlike me, have an actual knowledge of the subject.

(sigh, I'm just too slow)