"Oat Brown" usually refers to the mixed color of oat and brown. Oats are light brown and coffee is medium brown, so their mixed colors may be medium brown and slightly light brown.

However, "oat coffee color" can also refer to various shades and shades of oat color and coffee color in different proportions. Therefore, this description can cover all kinds of browns from light to dark.

Generally speaking, the specific hue and depth of "oat coffee" may be different due to the actual mixing ratio and lighting conditions.