ED and SC are very alike, yes there will be differences, but they are essentially the same game, space combat and resources, player driven politics and economy. They are far from what Curunen is saying.
If you put it like that, then yes - the game mechanics are obviously going to be similar, because of involving spaceflight, combat, economy etc. You could make that comparison with many MMOs for example - they also have economies and can have player driven politics - the only difference being space flight and combat.
But the philosophy behind each game is completely different - like I said, this is not me just making **** up, both DB and CR say it themselves.
I don't like how ED is heavily relying on procedural generation - the setting and lore are
not the focus of ED - it is the freedom of player choice and consequences in a system with rules. Again, DB says this himself - it's all about the game theory and interaction with players for him. It might have a nice shiny space setting and combat on the outside - which don't get me wrong will be a lot of fun to play I'm sure - but at the heart of it the lore and setting are secondary to the game's intent.
While SC at the moment has a heavy emphasis on dogfighting, the lore/setting/story are the centre stage, on which CR can create his vision of a dream space game. From having people in universe recording and broadcasting news and so on, the aim is for the universe to feel "real" and believable, where you can get immersed in roleplay or whatever you like. Again, totally different philosophy from DB.
I'm sure Elite could be recreated in a completely different setting, if DB found it would work well. SC cannot be anything other than in space.
Both games will be good to play, but don't pretend they are essentially the same game.