Duenia yours are all the same pony in different degrees of fading, yours are the more pink rather than red versions. Bearing in mind there was a few batches of them as my pink ones have differences in hair plug holes and eye paint but still the same pony
I disagree here. To me from the photo it looks like the one at the front has blue and the others more aqua hair.
So nice to see my site cited
yay
...so anyway.
I only have the three on my website but I am sure there are probably others that I don't have.
There are distinct hair type variations on them as well. In the year of production this set came out in Europe, there's a big change in the type of hair fibres being used. Many ponies from this year have therefore drastic differences in hair shade and/or quality even from the same set. I have only seen blue, not aqua in the hair of Dazzleglows found here, but I'm not ruling out that aqua ones happened here, too. It is all to do with the batch and how early/late they are I think. The one in Marlin's image shows quite nice condition blue, which suggests the original fibre. Other (probably later year) Dazzleglows have a rougher fibre (mine is in this category, bless her little hooves). I don't know if this also exists with aqua. I've yet to see it, or confirm if aqua happened in the European release.
I also am fairly certain our production was a year behind the US, which explains batch differences for body tone. Fading can happen, but I'm going to say openly that I dislike this as a generalised explanation for colour difference that is universal over the whole pony's body. It is illogical to think that a pony would fade evenly in all nooks and crannies, and it is more sensible to think that this is just a different mix of plastic and a different batch. Of course, these ponies DO discolour, but there are other minor differences. Such as symbol print and eye shade, which show that they are a different batch. When you have different symbol and eye tone evident on a pony, you can't assume the body is faded. And even if you feel it is, it's absolutely impossible to hypothesise what its original colour was, so it can't be assumed it started out life the same as a pony whose symbol print and/or eye tone is different.
Though that doesn't make it any more valuable, I think it's important to recognise batch as a reason for colour differences. I don't know about value differences with these, I'm gonna be honest, but it may well depend on where you're located and the quality of the hair fibre. It's quite hard to find one of the blue and pink haired ones with the rougher hair fibre whose hair hasn't met the Frizz Demon. Which is why mine has her hair in braids
And now I've been the ultimate geek once again, I'm gonna go