the entama is the japanese version of the v4
the v4 and entama got almost the same characters, but the way of obtaining them is different
example: on the v4, you get makiko by having a certain amount of skillpoints on the v4 when you got memetchi. on the entama, you need to have a certain amount of skillpoints in 3 days after getting an adult, and you also need a specific job to get it when you have memetchi.
you can also cook on the entama ad can't on the v4
of course, as the entama is the japanese version of the v4, the entama's in japanese. the v4's in english
as far as i know, these are the differences, correct me if i'm wrong