Toby Jugs, Half Size Twins

The Blue and Green Half Size Twins
Both bought on Ebay, the one with the green coat came from Australia ( about 400 gbp ), the blue one from the UK ( about 150 gbp ).
They are both exactly the same, and from the same mould, with exactly the same glaze and finish. But for some reason, the green coated one looks much better, and looks much older.
When I first recieved the green coat, I was sure it was about 1830, made in staffordshire and a quality piece. When recieving the blue one, I thought that this must hacve been a cheap copy, recently made, not to the same standard. but comparing them together they are both of high quality and exactly the same.
The only think that I have managed toi find out about both jugs is that the same jug is featured in thre book by Captain Price, with a black and white photo displayed, with the word "fake" in the descriptiuon field. As this book was printed in 1921, then the jugs must be before this date, but if Price knows them as fakes, why did he put a picture in his book ?
Date could be almost anything. I would put it any where between 1820 and 1920, but I would love to know what Capt Price knew. I have seen these go in markets for about 100 - 200 gbp though, so they must be a pretty good fake.