Thanks - any thoughts on why these odd changes/differences? Intentional or Errata/Copy & Paste Typos? (Sorry probably getting a bit OT...)
Easy: it is a cut-n-paste error.
The skills tables in SMC are an exact duplicate of the "base six" careers (twice). It is pretty obvious that they copied over the charts from The Traveller Book, then intended to change them to what is shown in S4. But ... then forgot to do that part of the update. BTW, this is not my opinion. This is explicitly called out in the Consolidated Errata file.
The interesting thing is that the other information outside the skills tables *were* updated in a good and useful way. Careers with rank names get names for all six ranks, not just one or two. It explicitly notes that careers with no advancement get two skills per term (like Scouts). There are a couple other things in there, too.
So, to get a completely "proper" set of "Citizens of the Imperium" careers, you would need to do the following four things:
1) Take the section from SMC as the base.
2) Fix the name of the Noble rank 5 to be "F Duke" like it is supposed to be.
3) Replace the skill tables, in their entirety with the skill tables from S4. But take nothing else from S4; just the skill tables.
4) Change the skill in slot 6 in the Education Table for the Rogue career to Tactics (instead of Ship's Tactics).
This together gives you what the Citizens of the Imperium careers were meant to be.
As an aside, I created a PDF that does exactly this. So, I have my very own version of that section of the SMC that puts all of these fixes in. No house rules, no conjecture, just what has already been stated as known and acknowledged errata. But I don't think I am allowed to share it, unfortunately. If the mods want it, I can send it to them in a PM and they can do whatever they want with it. I make no claims and take no credit for it. It is just what was supposed to have been presented. If allowed, I would gladly post it here for everyone to use.