You’d be better off comparing the same stages. ST4 typically includes all except the “healing” of ST1 (with Emperor Fitness being an exception because of how it’s laid out)
Where ST1 is a “breakdown of beliefs” type of “healing”
but DR is a full-on healing sub so ST4 has a ton of healing, right?’
and Khan ST1 seems to have the same purpose
From the Dragon Reborn sales page:
STAGE 1 – DRAGON FIRE
Crushing all your deepest fears, emotions, traumas, beliefs and energies is the prerogative of ST1: Dragon Fire. Similar in function to Khan’s ST1, Dragon Fire doesn’t have the limit of removing only that which is standing in overall execution of Khan. No, Dragon Fire will breakdown every single part of your being, from the physical all the way to the deepest levels of your spiritual being.
Every single part of your being will be cleansed by the flames of the dragon. This includes energetic blocks, negative emotions that you are holding on to, tensions in your body, conditioning, traumas, as well as any harmful subliminal influences you might have picked up on during your subliminal journey.
Khan ST1 destroys all limits and traumas that stand in the way of wealth, women, masculinity, and all Khan objectives which is quite a lot.
DR ST1 on the other hand burns away ALL your limits and traumas that stand in the way of the life of you want.
Khan ST1 is like having a wrecking ball while DR ST1 is like a dragon breathing fire on you.
I see the logic underlying your comparison:
"What’s the difference between the (clearly powerful) healing in Khan Stage I and the (also clearly powerful) healing comprised in the overall Dragon Reborn subliminal?’
Yup. I agree with @Lion.
Dragon Reborn: Comprehensive, evolutionarily-focused, liberates and strengthens the foundation of your current optimal version
Khan St I : Deconstructs that which is incompatible with your mind’s interpretation of the Khan archetype and the Khan objectives
(FYI: I have not run Khan.)
Also, check out the Objectives at the bottom of each Program Description. That will lay it out for you with specificity.
Sometimes, when I’m interested in comparing two programs, I’ll copy their Program Objectives and then paste them into two adjacent columns of an Excel spreadsheet. Then you can compare and contrast to your heart’s content.
The deeper question to ask here is, I think:
When Sub Club refer to “Healing”, to what kinds of processes, precisely, are they referring?
That’s also worth some contemplation.
Thank you for your reply.
Khan ST1 has an obviously more relentless tone in its description than DR.
It seems DR ST4 is the stronger choice for emotional healing, though.
Thanks again for your reply, I appreciate it.
Thank you for your reply. 
It helps a lot, as always.