Ki-Fueled Attack Optional Feature Versus Martial Arts Feature

The Martial Arts feature allows for a bonus action unarmed strike after a main attack of an unarmed strike or a monk weapon attack. The Ki Fueled Attack feature allows for either an unarmed strike or a monk weapon attack after spending a ki point (such as on a stunning strike) as part of the action. Am I right in saying that the differences between the two are limited to the following?:

  1. Martial arts has to be an attack, Ki Fueled can provide for something else, such as a subclass feature.
  2. Martial arts only has an unarmed bonus attack, Ki Fueled attack can be a weapon attack.
  3. Both and/or either in any way only allow for 1 additional attack as a bonus action.