I'm pretty sure I saw a prototype Boxster with a 993 Carrera front end with round lights in a book that was recently published (has the 918 on the cover forget the name). Did not look right....
Personally, I much prefer the Boxster lights. Anything found on the GT1 LMP is pretty darn cool in my book. But you being a Carrera fan I can see how they seem unusual to you.
I was never really a 911 fan growing up. I much preferred the more forward looking 917, 928 and 944. At least with the 928 and some of the flat nose 911's the round lights looked more shark like and less VW beetle like.
In fact I liked the non-round lights so much I have one these in my dinning room.