the sets are 00-04, 05-07, 08-11. each one has a slightly different design. on the 00-04 the bottom of the front struts are a smaller diameter than the newer ones, 05-07 and 08-11 are same. they all have different top hats and different spring design.
they can be swapped between years, but require different parts to do so. the issues you have now is if you want to keep the springs you have you are limited to dampers that will work with those springs.
on the rear all 00-11 are the same exc the wagon. same springs and dampers.
2010 Volvo C70
2011 Harley FLHTK
Midwest Crew #22