The one with the fold-over rim (blaue speckled black) is actually ovoid or "flattened". I'm guessing that when it was just about finished, they reheated the whole piece (except for the base) and used paddles to squash it ....hence the rim. So, it's a quirky piece all round and I like it because of that and if asked to ID it I would be stumped.
As to your two pieces Ruth, please understand that I am not an expert on Chinese glass and am learning along with everyone else. Also, all these pieces are Terry's so I haven't had the opportunity of handling them myself.
I have seen some labeled Chinese glass in a smart "design" shop in Hay's Galleria
the old tea clipper wharf on the south bank. The quality of that stuff was stunning to me. Faced with it, without labels, I would swear it was Scandinavian and try as I might I coiuld not fault the quality. I must go back and buy some, when I can, to add to the site.
However, sticking my neck out here, I would say that there are enough similarities between these your two vases to say that they were came from the same place, and I would guess Chinese. I don't think you can read too much into relatively small differences in quality.
What does the label say ?
Your refs to Snowflake are also lost on me. Sorry !