Well I have a Glee with the lower seat, but bizarrely that one has no distinguishing markings so I imagine yours will be similar. The lower seat looks a bit more 'scooped out' where you plant your arse, but I imagine it would be hard to tell unless you've got one of each type in front of you. You'll be able to find the manufacturer's spec somewhere as to what the respective seat heights are; it's quite hard to measure them accurately in practice, and the difference between the normal and low seats isn't that great; but at least it should give you an inkling.
If the current seat's actually standard, maybe consider a higher one?
Also, if you didn't notice the issue until someone pointed it out... does it matter!?