The first one yes, the second on I'm going to say no. The 98 lowers are 98 specific. The second # u put looks like it's for 96/97 based on the design. After some research on other forums, felpros 98 style lower IMRC gasket is on backorder. HAs been for a while.
However, if you need a good set, hop on another forum SVTP,Corral, etc and PM NA SVT (Todd). I'm not sure if he hangs around here or not. Last I heard he had some new ones available, and if he doens't I bet he would have some good used ones.
But, again, I wouldn't replace anything unless you see they are bad. The First part number you posted with the upper intake gasket and the upper imrc gaskets I've NEVER seen go bad.