I do have the set of six, US boxed. I also have a high tide in a CDN box. I have only two small bookcases, just painted the pony room a couple months ago and put in flooring. Have to save up for shelving so most of my things are still stored, unfortunately. The seas are more difficult to access since the boxes were so fragile I did wrap them well before boxing them with the rest of my MIP and moving them in.
Those pink shell brush/comb sets will vary, as they can fade easily, also the pigment tends to bleed out on some and sit on the surface. They are all intended or supposed to be the same shade on both the yr 2 and yr3 seas so it's any pink shell/brush comb.
So don't worry about shade differences. (I should also mention, I have the set of year 2 girls MIB, and loose complete from a childhood collection as well to compare)
Combs/brushes are pretty easy though to match only 3 colours between the two adult sets (blue, pink, purple), even though sometimes a pony would be miss-packaged with the wrong set (blue or pink yr2) or (pink or purple yr3), based on everything that has passed through my hands, and mib's I own to others here's the yr 3's that should have pink sets.
-Wave Jumper, Sea Mist and Sea Breeze all were intended to come with pink sets.
the other three were purple.