Actually, there might be another explanation as well

...
If my memory serves me right (I don't have the collector's guide here on hand), there were two different eggs containing this knight. Same number (as all eggs of the same year have) as they were both produced in the same year. The only difference between them, according to the Collector's guide (again, if my memory serves me right) was the colour of the EGG.
Both were blue; but one of them a darker hue.
Your picture of the egg-knights show one egg being a dark blue and the other a lighter blue.
Perhaps that wasn't the only difference, but differed they also in hair-style and colour of the knight

Bogro