Longer lug bolts on rear?

[Jeffd]

I bought my 2000 Boxster S with one size larger tires than stock. The rear had 1/4” spacers to clear the tires. I’m going back to the original tire size and eliminating the spacers but the rear lug bolts are at least 1 cm longer. The fronts have 28 mm shanks so the rears are probably around 40 mm.

Anyway, my question is, are the front and rear lug bolts typically the same length? If so I’m just going to put 28 mm all around and ditch the spacers.