= 2.2.3. Differences between short/long (reduced/full) vowels in harmony

Are there differences between the similar short and long (reduced and full etc.) vowels in harmony?

^  ^ Finn. ^ Seto ^ Er. ^ HMr ^ MMr ^ Ud. ^ Hun. ^ SMn ^ SKh ^ VKh ^ Nga. ^ Ka. ^
^ F/B     | no  | no  | — | — | — | — | no  | no? | yes | — | — | yes  |
^ R%%|%%T | — | — | — | — | — | — | yes | no? | — | — | — | yes? |

<fs smaller>
F/B: front/back harmony\\
R|T: rounding, total harmony\\
—: not applicable
</fs>

  ; Hungarian
  : In rounding harmony, there is /ɛ/ : /ø/ alternation, but no /eː/ : /øː/ alternation. Moreover, /ɛ/ : /ø/ alternation is always part of an /ɛ/ : /ø/ : /o/ alternation, and there is no  /ø/ : /o/ alternation without an alternant /ɛ/ (some dialects do have such suffixes; in Standard Hungarian, there is a derivational suffix /nok/ : /nøk/ without an alternant /nɛk/,((Cf. //hírnök// ‘messenger’ from //hír// ‘news’, //elnök// ‘president’ from //el-// ‘front’, //mérnök// ‘engineer’ from //mér-// ‘measure (v.)’, //ülnök// 'assessor' from //ül// 'sit', //látnok// 'visionary' from //lát// 'see', etc.)) but its productivity is highly questionable).

  ; Southern Khanty
  : /ĕ/ : /ɘ̆/ alternation, but [i] : [ɨ] and [e] : [ɘ] alternations are allophonic, less consistent and even B allomorphs can be followed by F alternating vowels (weak spreading strength).

  ; Kamas
  : Full vowels exhibit F/B harmony (/ɑ/ : /e/), while the reduced vowel does not undergo F/B harmony after unrounded vowels but undergoes full harmony after rounded vowels (based on Klumpp 2016: 41).