Just downloaded the Blurb CMYK icc profile and assigned it to Andrew's color target with the woman in the pink shirt AFTER converting to US Sheetfed Coated v2 with Perceptual intent and it appears there's not much difference except Blurb's has a heavier total ink coverage than Sheetfed Coated.
No hue or saturation shift, just brightness increase similar to assigning 1.8 to a 2.2 gamma encoded image. Try it out yourself.
The profile is only useful for showing how over saturated and dark and rich colors (i.e. black shadows comprising R0,G3,11B=the hills in the OP's last posted image) are going to shift.