Possibly found somethings
From The Lost Media Wiki
I know this link (https://archive.org/details/LeManegeEnchantePolluxZebulonMargoteAutresVHS) is on this page multiple times but there have been added episodes that aren't listed here: 2. La chanson de Pollux 3. La chanson de Zébulon 13. Rencontre avec Azalée 14. Zébulon a perdu ses moustaches
I also possibly found a full episode listing of the 90s series: https://animeguides.com/guides/manegeench89.html
Finally, I found 4 mysterious episodes that also aren't listed here: https://picclick.co.uk/WALTON-FILMS-The-Magic-Roundabout-Geography-Game-303701321011.html
Feel free to reply, & any criticism and tips are welcome.