It takes a while to figure out the shades. Sometimes you may not find a match in one company, but will find a good match in another. I found a good match with Pure Luxe Creamy Natural. I am a Mac NW20. I am still sampling.
Because I am Italian, I always thought I had a yellow undertone. It turns out I am more neutral/cool toned. So I was ordering the wrong sample colors. Now I am ordering the neutrals instead of the yellow tones. It is a costly mistake, because those samples add up when you include shipping, then reordering with the same company.