There is no connection between the TCMD and TCC/LE version numbers.
The original TCC/LE was (and still is) roughly the equivalent of 4NT v6.
so he develops with his own copy and writes it to be LE compatible. ("Been there and still doing that ...")
Yeah, good luck with that :-p ... tcc and tcc/le are moving further apart with each version, so getting any complex script developed on tcc to work on le will be hell on earth as there's no "le compatibiliy check" in the debugger or the like, but you have to test-run every scenario to see if it works.
No need to use TCC/LE at all for running scripts; you can use TCC RT which is (1) free, and (2) compatible with the current full version of TCC.
The practical reality is that LE will be used on PC's at small companies where the owners would never even consider spending $80 (or even $40) per PC "for a DOS program" even for 3-4 PC's, no matter how useful the product would be.