We are painting our master bedroom and bath. The plan is to paint the bathroom one shade lighter than the bedroom. (going with a gray) Here's the question- Our master bedroom has a water closet aka toilet room- Should we paint it the same color as the bathroom or use the darker bedroom color. I'm leaning towards the using the bedroom color for a little contrast, and then using the lighter bathroom color for our walk in closet. Hopefully you can follow that train of thought, it sounds a little confusing when I read it back.
I would paint the water closet the same color as the bathroom because a toilet goes with the bathroom, not the bedroom. I would also paint the closet the lighter color just because I prefer a lighter color in closets.
As an aside, you might try painting the 2 shades next to each other just to make sure there is enough of a contrast. We tried to go 1 shade lighter in our master bathroom and you couldn't even tell a difference. It probably depends on the specific paint strip.
Ditto.
When I'm doing two shades off the same card near each other, I usually do 2 shades apart. One isn't different enough.