Will wheels for Boxster fit a Cayman?

[Dr. Kill]

Hi – I haven’t been here in a long time - I sold my Boxster about a year and a half ago. Anyway, I still happen to have a set of snow tires mounted on some knock-off wheels sitting in my garage. A buddy of mine just purchased a 2008 Cayman. I am guessing that she should be able to mount these wheels on her car when winter comes around. Does anyone know for sure whether these will fit or not?
Your input in this matter is greatly appreciated.

-Tim