The orange one is slightly bigger than the blue one, is orange and has the letter a next to it while the blue one is slightly smaller than the orange one, is blue and has the letter b next to it

orange bar is bigger, they are different colors, they have different letters beside them, they are in different positions, they inhabit a different amount of pixels, etc.

orange bar is bigger and there are different colours

one has different text, colors, and size.