This question came up in the Online 10-day Retreat Nov 3, 2020, guided by Delson Armstrong. Day 1 was part of a daily 30-minute discussion on the suttas, the Dhamma talk and reflections.
Slightly edited to improve readability
Yes, the 6R’s are really identical to the Four Right Applications, or the Four Right Efforts. You have four different Right Efforts:
- Preventing any hindrances from arising. As soon as you notice and recognize there is a hindrance, or a distraction, in the mind, you stop it from further creating more distractions or more thoughts. That’s the first Right Effort.
- Abandoning. When you Release and Relax the mind and body, relax the tension or craving. These steps are part of the abandoning any already arisen unwholesome states. If there is any craving or the tension associated with the hindrance, you are Releasing and Relaxing it.
- Bringing up wholesome states, which happens when you return to the Smile and you come back to feeling Loving-kindness or any of the Brahma Viharas, or whatever your object is. That is the third Right Effort in which you are bringing it up.
- Maintaining. As you return to your object, you are maintaining the good feeling, the wholesome quality of mind. And then you Repeat as necessary.
This is how the 6R process is intertwined with the Four Right Efforts. But whether you practice the 6R’s or the Four Right Efforts, it is identical. It’s one and the same, just a different way of understanding it.