I see. I had thought you were only looking to obtain an rgb file.
The value that VW assigns to it colors is in sync with those of other programs. For example, the blue on row 1 column 5 of the standard pallet is given a value of R:0, G:0, B:65535 (on a 65536 scale). If you create a color in Photoshop with values R:0, G:0, B:255 (closest value on the 256 scale) they appear pretty much identical.
However if you export the R:0, G:0, B:65535 color via eps, Photoshop reads it as R:63, G:64, B:150 -as you say, quite different. Similar variations with HSB.
Exporting as an Image file has no problem.
As long as I can remember this has always been an issue with EPS files, for if you take a color created in Illustrator, rasterize it into Photoshop you will end up with the same type of color variation. Not precisely a VW only problem.
I'm sure some clever person somewhere will or already has a translation solution, I have generally saved the use of eps files for bringing line drawings to other programs.