The first Guinea looks like a Blonde to me, (because IMO it looks too light to be a Chocolate, and too dark to be a Buff), and GuineaLady93 is correct it is partially pearled (dotting in the flank area and barring on the wings).
Non pearled birds are just that... non pearled, solid color. Pearling and barring are completely absent. There typically aren't crosses between the degrees or varieties of pearling... they are either fully pearled, partially pearled/semi pearled or non pearled/solid. Guineas can have the same base/background color, but have different degrees of pearling, which besides color is what gives each variety a new name. A simple example: Pearl Grey is fully pearled, Royal Purple is partially pearled, and Violet in non pearled. All 3 are basically the same background color, but all 3 have different degrees of pearling.
Maybe
this chart will help you understand what I'm trying to explain... it displays most of the colors in a chart divided into columns, with all the color names divided into the 3 degrees of pearling. It's missing quite a few pics, and there are a few discrepancies on it, but it's a fairly decent/accurate chart. (I have yet to find a 100% accurate Guinea Fowl Color Chart online or in a book... but there are lots of color charts out there, so the best way to get the general idea of a color and how it should look is to compare multiple charts).
The most recent pic you posted of the fully pearled birds... Lavender is on the left and Brown is on the right. (Some breeders would call color that a Cinnamon tho).
