If I am not mistaken, isnt every icon an icon of Christ in some way? Even icons of Saints?
In my icon corner, I have several icons of Christ. Even the iconostasis in the Church has Christ on one side, then Mary holding baby Jesus on the other. In one icon, he is grown. In the other he is a baby. I would say he certainly looks different in those two icons. There is probably an icon of him on the cross somewhere in the Church, as well as an Icon of his baptism, or him speaking to the 12. Maybe you see the icon of his resurrection somewhere as well.
The point is, every Church, or icon corner, is filled with icons of Christ and he probably looks a little bit different in all of them. Icons from greece may look a little different that icons from Russia or Egypt. Maybe the artist didnt have access to the perfect paint color for his skin 1000 years ago.
In conclusion, dont wory about it.