I am pretty sure that: 1. The Arduino Eve is the one used most, it is the one most readily available. 2. That the Arduino Eve is a legal redistribution of the Traveler Morph World 2 Eve with some additional hip/buttock morphs. 3. That ALL Eve characters available are compatible in all ways except the SENO New Eve figures which use the original Posette chest and collars (maybe neck) and also use different eye mapping depending on the version. I have always associated the original Eve with Traveler but SENO mentions Torino. I have always wondered if Vicky followed Eve, that is my impression. I have always wondered if that is why MorphWorld 2 came down.