Coil "A" is my 12v FBO coil that I have been using this past year. Coil "B" is my new MSD #8222 (High Vibration) coil.
Last Fall I swapped the FBO ECU for the MSD Streetfire unit and I kept the FBO coil and I have been running it all this year. Even though the SF box says that it will run with most 12v coils, I opted to buy the MSD #8222 unit (per MSD tech support & due to me mounting it horizontally.) just so I could have a matched "brand" set.
What surprised me was the resistance readings between the two coils. I could not find any of the specifications on the FBO coil, but it has ran fine all year. This coil will now be my backup unit.

I was just curious if there was anything to learn from the two different coils brands before I swapped them out this weekend.

Thanks for the replies.