congrats on your choice! that's a great bass and a nice looking one too!
1. Dan Lakin explained he'd designed the neck of the 4-94 / 44-02 as a cross btw a JB and a PB so most 'convetional' bass players would feel instantly at home with it.
The 55-94 / 55-02 however isn't a seemless transition from the 4-94/ 44-02. It feels wider and less rounded, the higher up the neck the more it feels 'flatter' and 'edgier'. If anything , it makes me think on the 'regular' position frets (1-9) for a usual bass player it is a 'riffing' neck whereas on the higher frets (12-22) it's more of a 'soloing' neck
2. I only had ebony on a fretless Lakland but various types of maple and rosewood on fretted Laklands. I'm not exactly in the tonewood corksniffing camp but somehow it always turned out that my most favorite Laklandsalways happened to be ash/maple, but ash/rosewood or alder/rosewood, less so. I did have ash/maple Laklands that I didn't connect with, of course; but somehow, there was never an ash/rosewood let away alder/rosewood bass that I loved, just never happened.
So there is definitely A difference, but it is up to you if it matters to you. As for ebony, I'd say it feels closer to maple maybe, and gives a faster response to arrack it seems