Yes, the Eau is much texturally "wetter/juicier", and the mossy base in the Eau is wonderful.
The concentre lasts much better, is slightly drier/more powdery, and noticeably more synthetic. The base is sweeter, less mossy, and more citric than the mossy base of the Eau.
For me, both are must owns. I own multiple huge bottles of both, in addition to some of it's predecessor, the original Hermes Eau De Cologne (7oz left in the 25oz jug) pictured on the far left in this pic from last year: