WRCH-100.5 would be better suited as an all-Christmas station because it normally is a Soft AC, and most stations that do go all-Christmas are Soft AC's. It's been said there's some overlap in the music and a lot of overlap in target demos between these formats.
WHCN-105.9, based on it's playlist as published on Yes.com, flipped at 6 A.M. this morning (November 25th).
WHCN-105.9 is A Christmas Channel (Clear Channel) Property, and CC is the most agressive company regarding programming all-Christmas formats. It seems to be a corporate directive that one of the company's stations in every market does this, although they do not have an all-Christmas station in Boston, one of their few markets where they don't have one (WXKS-107.9 is top-40/CHR; WJMN-94.5 is Urban/Rhythmic CHR, and WXKS-1430, which used to go all-Christmas when it programmed standards, now runs Air America programming).
BTW, WHCN's website has the "All-Christmas" look.
Could WRCH still follow suit??