I would guess WaPo edited the map. For the Guardian's version of slide it seems easy to guess that those are the names of secret programs use to tap fiber-optic cables in certain regions. NSA wanted 2 names of those programs to remain secret. (i have some theory why..). WaPo published the names but edited the map not to give precise locations of those programs. Just my theory ofc.

I think the OO.o/MS Office explanation is perfectly reasonable and applicable in this case. Even I suggested that was what the difference was when PRISM was first leaked, and I've not exactly been on Greenwald's side throughout all of this.