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By their fruits ye shall know them, but the works of their hands. 

What follows a character, despite the many masks they may wear, is their goals and their modus operandi. If the character acts the same way, exhibits the same values, and works for the same ends by the same means, we will recognize them as the same character. 

One the other hand, points of physical similarity between the masks don't suggest that it is the same character behind the mask. (If you want to hide behind a mast, why leave identifying marks on that mask?) On the contrary, using similar masks suggests a copycat rather than the original character, like a kid in a shabby halloween Batman costume.

So drop the similarity between the masks and focus on the similarities behind the masks, and your readers will start to get the hint.