I have (what I was told is) an "S" hardtop on my '98 986 and it has platinum/titanium colored trim around the rear window to match the front window trim for "S" models.
However my car is not an "S" model so the platinum trim does not match my front window....you wouldn't notice unless you were looking very hard. The top fits fine, just a very subtle difference to the rear window.
http://www.netcarshow.com/porsche/2002-boxster_s/
Half way down under "Discreet Design"
..."Titanium color highlights bars in the front air intakes, the windshield trim (and rear window trim for the optional aluminum hardtop)....
