Wheel bolt question

Sorry if this is an obvious question but I currently have a R50 with 17" R53 alloys fitted.
Are the wheel bolts the same (length) for all sizes of alloys on the R50? i.e. if I changed to 15 or 16s would I need to get new (shorter?) bolts?

Thanks!

Bolts are the same. They were only different for the steel wheels.

Thanks - that's exactly what I wanted to hear!