The Kaf HaHayyim was written roughly contemporaneously with the Aruch HaShulchan and the Mishneh Berurah, but is the last of the three seforim to be finished, with its final chapters completed by the young Rabbi Ovadia Yosef after the death of the author in 1939. The Kaf HaHayyim saw both of these seforim and quotes them both. Citations to the Mishnah Berurah can be easily found in Hilchot Purim, and citations to the Aruch HaShulchan can be found in Yoreh Deah 74, 75, and 76 (at least), but there are interesting opinions brought in the Aruch HaShulchan that would seem appropriate to cite in Yoreh Deah 69 and 70, yet Kaf HaHayyim does not cite them.
I haven't learned the Kaf HaHayyim from cover to cover yet, but maybe someone who has can answer this: where in Kaf HaHayyim does he first cite each of these works?
The Kaf HaHayyim cites ער’’ה often, but I think always refers to the Erech HaShulchan (ערך השלחן), by the Tunisian posek R’ Yitzhak Taieb, as that's the only work given for that acronym in the luach rahsei teviot. The work by Rabbi Yechiel Michel Epstein (ערוך השלחן) that I'm asking about in this question appears to always be cited by full name.