I'm pretty sure it's done by hand ;-)
Set necks have a volute and no laminates on the back of the headstock (unless custom ordered otherwise)  
The shape of the tongue is determined by the headstock, profile of the neck and the amount of beers (or any other beverage) the carver had the night before I think...
 
@ Mica: This bass is not a replica, more a tribute to one of my favourite Alembics. I'm fine with whatever tongue your carver(s) can come up with ;-)
 
I'm pretty firm on:
 
Tuner alignment
High gloss finish on the back of the neck
Logo and Script above the nut

The neck is hand carved. The variation arises primarily from the width of the nut. In Jason's bass, the neck is a classic taper, so the nut is wider than the second example with the comfort taper. The individuality of the carver is also reflected in the final shape.  
 
There are no volutes pictured on this page so far. Look at the back of an Epic to see the volute version (FYI these are also handcarved).  
 
Jason's neck in the first picture actually looks a little funky to me - like the tongue is lower on the beck of the neck usual - but maybe it's just the angle of the image.  
 
No prob on the tuner alignment, high gloss finish on the back of neck (though note Jason's were satin) and the placement of the logo and script.

Thanx!

I found this pic of an Essence I think it's about the same shape as on Jason's bass:
 

 
If possible, I'd like to see this tongue style recreated ;-)

For th black/blank transition: Can you lower the edge of the black in comparison to Marcus' bass?
 
Here's a pic:
 

 
Green pity excuse for an arrow points where I like to have the border.