this sort of quilting/honeycomb/diamond moulding, goes way back beyond even the date quoted for the 'salt' in the link - always reminds me of Ravenscroft's' 'nipt diamond waies'. Unless we are experts in table glass from the late Georgian period, then we won't know if the date quoted refers accurately to the piece in question - unfortunately there's a complete lack of provenance - so prospective buyers must either be up to speed on this piece and know from experience it is what it says it is - alternatively we simply take the seller's word for it. Think if I was paying this sort of price I'd want some provenance.
We're all accustomed to seeing the zillions of table salts from the Victorian period - usually heavy chunky pieces - quite different from the earlier cut glass jobs, often shaped but, presumably, very rarely given the sort of coloured decoration as in the link. Looking in the books, the majority of salts from the first third of the C19 appear to have chunky square or diamond shaped feet - could be the linked piece looks a tad too delicate for a salt??
I'd hazard a guess that the piece linked might be a tad larger than the piece here, and if it was intended for the use quoted then possibly it might be a 'master salt'. Certainly the moulding on both pieces is remarkably similar - whether that has significance is a matter of opinion - and we always have to remember the word 'copy'. I'm still of the opinion that both pieces may have been intended as sweetmeats of some sort, or a Monteith, as mentioned. You might contact the seller and ask if there is provenance for their quoted date and use.