Difference in ohm rating on plug wires?

Nope. There are virtually zero (I say virtually because I don't know every ignition system out there) electronic ignitions that will tolerate solid core wires. I first tried it in 1980 and it was a nightmare.

The ONLY ignition I KNOW for a FACT that uses solid core wires and must use them is a convention magneto. The MSD mags use a suppression wire. I can tell you solid wires on an MSD mag is a disaster.
We switched to the MSD ignition way back when they first came out, on the hemi. We had solid plug wires on it for about 1/2 a season before we found out ''u can`t do that," when we switched wires , we couldn't tell any diff . !!