Was the Game Boy Color a successor to the original Game Boy?

[Barkley]

Luke888 said:
Of course it was, sales are set apart between Game Boy Colour and GB meaning that they are from different generations, the GBA and the GBA SP aren't divided.

Actually I don't think you will be able to find sales for the GBC that aren't grouped together with GB sales. However the GBC is listed as being a 5th generation console and the GB a 4th generation console.