Little Women/Good Wives

I've just learnt that Good Wives is a purely British way of referring to vol 2 of Little Women. I wonder though what accounts for the textual differences between GW and vol 2 of the two-volume version?

So for example, in the opening scene of the one-volume Little Women, Jo examines the heels of her boots in a gentlemanly manner while urging her sisters to spend their money as they wish, whereas in the two-volume version, it's the heels of her shoes.