Between 1949 and 1959 Harlequin Books reprinted 19 titles with different numbers in the series. All other reprints used the original number. The same number reprints, with one exception, are identical. The exception is TheGolden Feather by Theda Kenyon. The reprint has two changes to the front cover - the addition of a 35 cent "Jumbo Book" stamp and a change in the blurb, one of my favourites.
"A Realistic Novel of Hate, Passion and Feminine Frailty". Whew!
The book was first published in 1943 (New York: Julian Messner).