These Sparkle Ponies have a small symbol on their face (missing from the store release versions).
Star Hopper: 
Napper: 
Twinkler: 
Sky Rocket: 
Star Dancer: 
Sunspot: 
Mail Order Sparkle Ponies (Year 7)
These Sparkle Ponies have a small symbol on their face (missing from the store release versions).
Star Hopper:
Napper:
Twinkler:
Sky Rocket:
Star Dancer:
Sunspot: