Actually no. The Concept R was first shown at the Frankfurt Show in 2003 and was a 265 bhp V6 mid-engined 2-seater (which is why it was billed as VW's Boxster).
The similar-looking (at the front anyway) Concept C, first shown at Geneva in 2004, is what the Eos was based on, and looks very much like the production car, although I doubt if there are 2 single parts which are the same... It was generally much lower and sleeker but was no doubt not roomy enough for practical production.
There was also a Concept T shown at Detroit in 2004, which was a 4WD design.