My take on this is no. You only get more credits for your data if you sell to a station in a CG scenario or if you pledge to one of the guys in the PP (dont know who - dont do PP).
Selling to systems that will give you permits to other systems, get you that permit too.
Iv just sold to my 'home base' system when returning, players state that spreading the data around to many systems of a particular faction, will improve your status with that faction.
That's something that iv not done, but now im Elite, i want to up my ranking with the Independent alliance. So now im in Independent space, working on my rankings with system factions.