The auction one has a very thick outer casing and that is not typical of Ysart, but is of Strathearn where the casing was thickened to allow the seal to be used. But the second link is a tapered green vase? I have always felt that the copying of a makers works is a compliment. Most of those who learned the Ysart techniques and made glass in the style also added their own twists. Herbert Dreier certainly made some amazing pieces, Peter Holmes style being mostly in the Ysart techniques with his own decoration ideas, his tend to be quite heavy too. Chic Youngś are interesting as he learned from Paul rather than the others in the family. His palette is very different but is closer in quality to Monart. Most of the others rarely made glassware. Hand shaped glass will always carry the fingerprint of the individual who made it but to understand that you need to study the techniques to get a grip on recognising these.
Fakes are deliberately made to be sold as someones work and represent a fairly small group, Much being misrepresenting by sellers and this is where Ysart was well served by a single seller who saw the whole thing as a game. The misrepresentation and alteration of Strathearn pieces started at the same time that an collecting interest emerged at a time when the price premium was very small.
As to the makers, if they came forwards it would not really hurt them and it would at least give a focus to collecting of their pieces. Most people who think they know have got it wrong.