I can't agree there are more differences than similarities, because I can't actually see any of those Mike posted in close up in order to tell - apart from one, where I can see there are differences in some ways and most obviously with the legs/hooves on the horse.
That said, again it is hard to tell because they are moving legs whereas mine are stationary and of course they are horses legs rather than dogs legs so comparing those two is also difficult. I can't see the pictures of Mike's dogs closely enough to make any comparison at all although the picture of the dogs standing still, indicates their legs are fairly straight and undefined, much like my horse legs appear to be, although there is definition in them it's difficult to show in the photos.
Is there evidence somewhere that these sets were all identical? (I'm not ignoring the fact that differences can be subtle and are not necessarily to do with colours, and the 'overall' look of the piece).
Personally I do think the horse Mike has put in close up actually looks more like the horse on an ashtray id'd as by William Swingewood Jnr, page 178 Hajdamach 20th Century British Glass. If so would these goblets have still been made in the 50's (which is the date one of WS Jnr items in the book is id's as). If not and these sets are dated to the 30's then I presume it is possible that there are differences in the detailed execution of these pieces by the same maker, as the rider and horse in the goblet in 20th Century British glass also looks slightly different to the one Mike has.
Frank are you aware of another maker who could have made glasses constructed in this way? If we assume they are Stevens and Williams for now given there are a number identified as Stevens and Williams that look remarkably the same, are you aware of another lampworker who would have been able to make these goblets at Stevens and Williams?