Ok here is my list: ( TH= too high / MNR = maybe not right / D = different)
I compared the alpha 17 hairs with the alpha 15 version of them when I thought they looked "wrong/different" so these are the one I found.
The hair_kitty_bejeweled.qb is not to high but the strands in the face don't connect with the rest of the hair like they did in alpha 15 (see pic)
The hair_kitty_queen.qb is 2 pixels to high it shows significant at the ear/hair position (see pic)
hair_sheep_pixie.qb and hair_8bit_hawk2.qb look different from their old (alpha15) versions. I don't know if this is on purpose or not so I thought "just put them in". (see pic)
I made compare screenshots of the hairs but I don't want to spam the chat full with Images so here are just the ones I thought might help to explain what I'm talking about:
I hope that helps. I will jump into my bed now and dream of cute and fashionable hearthlings
Short Edit: these are the hairs I "found strange" I don't want to say that this list is complete and I don't want to offend someone with this opinion! Just wanted to make this clear it's hard when you only have writing and no mimic and gestic.