The electrical system on a '98 is more like a 24 valve than a 12 valve because the '98 was supposed to have a 24 valve engine in it but it wasn't ready.
It would be a hassle to combine the electrical from any earlier 12 valve with a '98.
For sure it could be done but it won't be a matter of just plugging things in.
Most connectors are different, you'd have to figure which wire is which on either side of the connector and splice them together.