I don't see a need to change the icon from what it is currently, it's a lot easier to see than it was previously. I have never seen anyone confused about what role they are unless they're new to the server and just dont know how to play in general.
Yes, the icons looks the same a I and a T are going to look similar but they are two diffrent colors, The Innocent color is green and the Traitor color is red, Two very diffrent colors that would be difficult to mix up.