ALL the early Glitter ponies have it:
Sunbeam
Majesty
Moondancer
Glory?
Surprise
Gusty?
Firefly
Sparkler
Possible differences could be the mail order Vs store release.
Moonstone (and the other 5 rainbows from this set)
2nd set of Rainbows
6 original baby ponies (Glory, Moondancer, Firefly & Surprise all have releases with the paint under the glitter and some without)