Yes, the door key and igntion cylinders are the same. You should be able to use any assembly from 1991 thru 1995, but I would caution using older units from high mile vehicles... They may have as...
It depends, if the 98 has 14" wheels (mine does) No, but if they have 15" they should, though the rim offset is slightly tighter, slight tire rub on full turns (parking) front rims (and tires)...