'll try painting it so there aren't any borders but the two colors look vastly different. I know in the photo it is hard to tell. The large poster board is very beige and the smaller board is gray almost gray-green which I really like. The smaller board is from the paint store so I'm wondering if that is more of a true representation of the color?

I’m doing the same thing with colors and you definitely can’t leave borders. Also the wall color is showing between the poster board and the counter - too many influences. Paint the large one edge to edge and then place it with the long side on the counter so you have more coverage

Ok, I'll try another board. I'm really hoping what I see on the big poster board is incorrect. It looks like a very unattractive color!

The white isn't helping, that's for sure.

You should never compare colors on a white background because white will make the color look more muted and darker than it really is.

Rules of Color #1:

A color chip will appear brighter or less gray if the background color is relatively dark or black. The same chip will look dimmer or more gray if the background color is relatively bright or white.

I now have tried the color having painted the whole foam board and it looks much better and more of what I expected the color to be. Of course now in my room it looks a shade too light. I am comparing it to Pale Oak and I think Pale Oak may be better for our living/dining/kitchen that gets lots of light and southern, western and northern exposure.