Comparing the numbers:
215 vs. 225 = wider tread patch but due to height of tires, may be approximately the same.
65 vs. 60 = wider but shorter height tire may equal out
16 vs. 17 = taller tire.
With some dimensions like 17 inch wheels being larger and 60 series tires being shorter, they may equal out. Did they change lug patterns between the two trim levels? Probably not. Most likely, the difference in the two trim levels is in the powerline and the cosmetic trim.
Both the '06 and '08 16 and 17 inch wheels are 6.5 wide with a 4.5 inch 5 lug bolt pattern
For example, everything that fits my Explorer Sport Trac XLT will fit the lower trim level Sport Tracs and most parts will fit the Explorer SUV.