i just noticed another really big difference.
Eve Echoes has more and other lanes between the systems.
I just went to Algasienan. This system has normaly on links to Archavoinet, Osmallanais and Vivanier (and is a high sec pocket).
But in EVE Echoes there is also a link to Shaggith, in Kador. This is FAR away from Placid.
I have no idea how many more of these extra links are there. But this alone was a big surprisse.