Not sure about this exact '98 --> '96 combination, but... In general, 4Runner-to-Taco transplants will get you '2 out of 4' (worst case) or '3 out of 4' (best case) bolt holes matching up as is.
TTORA forum is the best Toyota off-road club around. We are nation wide with chapters in most states. Come in and discuss Tacoma, 4Runner, Highlander, & TRD models.