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.