We consider this small shades of the same color to be the same, as in Uruguay, Argentina, New Zealand, Rwanda and others. I'll add a caveat about that. Many other flags also have small black lines, but we don't consider them as well, being the case of Cambodia and Oman. We don't consider greater lines that are part of the drawing, as Liechtenstein. I'll also add a caveat about that.
Hope I cleared it up for you! :)