I think it is up to you to decide whether Cauldron and Sorcery are original EP games or not. They contain features that CPC and Spectrum versions don't which makes problematic to decide if they are original EP games or not.

Ich meine, es hängt von dir zu entscheiden ob Cauldron und Sorcery echte Enterprise Spiele sind. Sie enthalten Eigenschäfte die die CPC und Spectrum Versionen nicht haben was erschwert zu entscheiden ob sie echte oder nicht echte EP Spiele sind.
(I hope the German sentence is correct. If not, you can correct it in the Off topik. )

Same problem with Wriggler: there is an official version of Wriggler (very similar to CPC version) but there is also an unofficial conversion of the Spectrum version, made by Endi.
Exolon and Impossible Mission 2 also have both Spectrum and CPC conversion, they are all unofficial, CPC conversions made by Geco.

Hungry Creature was "developed" by me, an original Enterprise game, not conversion. It is me who "coded" both "graphics" and music, sound effects if it is important for you. Originally written in IS-BASIC, compiled by Zzzip Integer Compiler. (Unofficial game, of course )