Blizzard numbers items as they are created, so the named items next to ID 203734 (203725 to 203743) were usually added in the same batch as Snow Blanket: the same quest line, zone, vendor or reward set.
Gleaming Moonbeast's ReinsID 203727 · Miscellaneous · item level 30"Teaches you how to summon this mount. This mount changes depending on your Riding skill and location."
Ominous Chromatic EssenceID 203729 · Armor · item level 418"The beauty of its swirling colors belies the cruel experiments that followed."