I would assume so, given that they should use the same model and the textures look the same. You'd just have to manually look through the TPC files in JC's mod to find the right files to replace.
I just played through the game for the first time in years with this mod (along with TSLRCM) and it was a blast.
I did encounter one bug, though, which was that at some point my Exile's current HP became higher than their maximum HP amount. I noticed this because my character would take damage without the health bar ever decreasing. When I finally checked the character record screen, I noticed that my HP was somewhere around 400/150. Not sure what could have caused this, but it defeated the purpose of increasing the difficulty. Once the excess HP was taken down by enemies, however, the issue resolved itself.
Also, at times it seemed like enemy NPCs were not doing much harm to my party members such as during the party only missions on Narshadaa. It was not clear if this was due to the enemies being designed to be easy to handle, or if it was something similar to the previous issue.
Besides that, the only issue I had were the level requirements for some of the game's quests, such as sparring with the Handmaiden and Kreia's training being too high to ever be unlocked. I could easily go without those things, though, because the gameplay was so much more enjoyable.
Having said that, this is exactly the type of mod I was looking for, and it definitely made the game satisfying and challenging. Thank you so much for taking the time to work on this, and being gracious enough to share it. If you ever decide whether to update it in any way please do not be discouraged in doing so by the low number of downloads or comments, as I can assure you that I enjoyed using it very much.
Thanks again!
P.S. I forgot to mention that I finished the game at level 12, rather than 20. This was one of the few mods I had installed so I'm fairly sure it was due to this. Not that I'm complaining, though, because that was easily one of my favorite parts.