I'm pretty sure the rightmost of the three is a Malla. The cho is pretty distinctive, and it has the simple straight-line Sword of Shiva, and the general blade profile of a Malla.
The Malla has a flat spine, different from the V-shaped spine of most HI khukuris. Can't tell from this photo, but if it has a flat spine that would be more evidence.
Not so obvious about the other two. Maybe if you can post the lengths and weights it will help someone to identify them.