Jeep Strokers

Can someone tell me the difference between the 95-98 gasket kits and the 99-06 kits? I Know you can use the different year model heads and timing covers on the various models but I can't for the life of me figure out why the later model gasket kit is nearly $100 more the the one for the older model.
Thanks, Al

Ok according to the parts supplier I bought my gaskets from they take different main seals and intake/exhaust gaskets.
Al

Older main seals have "wings" on the cap side, the exhaust manifold/head exhaust ports are the major difference in the manifold gaskets.