I had thought about using 3 dots at the top for the 32-bit clue and 3 more at the bottom for the 64 bit clue. But there's no way of knowing what one would like and it's just a kludge.
I'd go with different colors and change the splash screen for Sonar X2 to have the same color code.
The Splash screen is at the program installation folder called Splash.dib.
I think DIB and BMP files are nearly the same so you can rename them and use a simple editor.