The two are the same. There is only ONE switched 12V ignition feed coming from the key through the firewall, and that is the traditional "dark blue" "ign1" feed from the ignition switch. On 70/ later models, it feeds the ballast, the regulator, the field for the alternator, electric choke if used, and I think idle solenoid/ distributor solenoid if used.
The PROBLEM with that whole circuit is that it's subject to deterioration of the ignition switch and it's connector, the bulkhead connector, AND it is NOT fused!!!!!
