Yes, the headlights are also different between the two, as are the wheels.
The biggest giveaway is the front fascia, where the front grille on the 550 looks like a "smile" and includes foglights in the corners of the grille. The 575 does not have foglights and the grille is more of an oval.
Search Google Images for head-on shots of the two and you'll see how easy it is to tell the difference when seen from the front.
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