Tea Rose is slightly more taupe in the new formula and it has a bit of luminosity compared to the old. Storm Grey is lighter, more of a grey than a chameleon grey, and it's pretty shimmery. It could be my skintone, but my Rosewood is more lavender taupe compared to the new one. On me, the new one is a little darker and a tad warmer. It appeared that way to my sister as well, who also has the old formula. If there are differences, it's really slightly and most people probably won't notice. The old Pale Barley was more shimmery and interesting to me than the new one. The base colour was the same, though. The new formula is indeed silkier and pigmented, though, so if the little nuances don't matter so much to you, I would say there is no need to rush out and try to find all the old formulas!