My guess would be surf rider and wavy. Can you move the mane on the more vivid colored one so we can see the chest?
The vivid coloured one is definitely Surf Rider, even without seeing her chest

Small image but still visible: (not my pony):visitors can't see pics , please
register or
loginWavy is a much darker colour with coral hair:
Sorry but you are not allowed to view spoiler contents.
The one I was wondering about is the faded one and Seaspray, but she'd have to be very faded and have lost her necklace completely, so I think she's also Surf Rider.
Sorry but you are not allowed to view spoiler contents.
Neither look pearlised although the US had a pearly and a regular Surf Rider...I don't suppose there's any pearl residue on either baby?