The lavenders are the gray looking ones with the broad gray stripe on their heads. The pearl one is the brown one with a broad dark almost black stripe on its head at the top of your photo.
Pearl gray keet
http://guineas.com/colorchart/color/pearlk2.jpg
Lavender keet...
The majority of the keets in your photo are lavenders. I can see at least 10 lavenders, one white, one pearl and one chick.
Please enjoy them and good luck.