If any kind of dev to cmtx conversion is doable, it would be done with the e-Sword software from which both of these files actually originate. Perhaps it is just export of some data or maybe it's not really possible. In either case, we have not found any specific information about this, so if you have issues or really think this should work, perhaps it would be best to contact e-Sword support or online community.
Updated: February 28, 2023