Question What is the difference between the Pulsar Superglide vs Superglide 2?

I was looking at the glass skates for the X2 and I saw 2 different versions of super glides for it

One was "For Pulsar X2 Series" for $21

And the other was "Superglide 2 for Pulsar X2V2 / X2H /X2A / X2" for $24

What's the difference?