Pamco High Output Electronic Ignition Kit Coils?

[Hombre Verde]

I am looking to buy the Pamco High Output Electronic Ignition Kit from Mikes and have a question about the coil. All the reading I have found on the forum talks about the #17-6810 "Green Monster" coil. The kits now come with #17-6903 coil. The kit info still states 75k volts. So what is the difference between the old #17-6810 and the new #17-6903 coil?