I did wonder what the difference was myself but being a non-tiler I assumed you lot would all understand what the difference was. Obviously this is something only the inventor is privy too and in my basket of questions to him I will add this one too!
My gut feeling is these people are probably great at engineering and production but not so hot on marketing and product messages.
Not really sure how useful it is to know that a pack of 20 spacers is enough to lay 25 wall tiles or 27 floor tiles.
Based on what assumptions? 800mm x 400mm ? or 600mm x 300mm or what about mosaic tiles?
Its a bit of a blank statement. I think the inventor was worred that buying 20 spacers seemed a bit mean because the standard ones come in boxes of hundreds.
So its his way of explaining there is enough in the pack.
But my view is it makes things more complicated to understand.
Probably better to have a pack of 250 and say this is enough for an entire bathroom project.
I hate marketing statements that raise more questions than it answers.