There are many versions of Ventress's sabers from various sources: different in different comic books, different on the comic book cover from in the comic book, the Clone Wars cartoon on Cartoon Network and several action figures. Therefore, each pair of fan-made Ventress sabers has been wildly different from the next.
The sabers from the animated "The Clone Wars" series is of course also a lot different than any version of the saber that came before. It has a square emitter, which none of the others had.
Luuke (now under the boardname "BlueMirageStudio") based his version on Jan Duursema's cartoon drawings, such as they were in e.g. "Jedi: Mace Windu".
I can make a different interpretation from the same drawings ...