Not necessarily. When the youngster that you produce start breeding with each other all the hidden color genes will start showing up. The reason the first generation will be pearls is because pearl gray is the dominant color. But many of those offspring will only have one pearl gray gene plus at least one other recessive color gene. The second generation may contain all kinds of surprises even ones that you don't expect.
I never expected to get Royal Purple keets from a Coral Blue hen mated to a Chocolate cock but that is what I got. The next generation also produced some Violet keets from the Royal Purple hen mating with the Powder Blue cock.
Good luck.