>>11383749If it has some sort of dye, slime, chalk, snow, coloring, marker gimmick, it's the new generation of dolls. The newer generation of dolls are more "cutesy" than the old one, but this isn't 100%, pic related is an older twin set.
If has none of those above and jointed wrists, its the older dolls. Note how the wrists in the image are jointed.
note: the color and create new gen dolls are generally liked even though they are a worse quality because owners can dye the hair to whatever color they wish (white hair) so customizers like them.)
In general, buy the dolls you like, just be aware the newer ones are slightly worse quality. Also, the newer ones if you want them, shop sales; target often has toy sales (10-25% off) quarterly or price down events, and so does Amazon.