As far as I can tell so far, the same base sample set is there, but due to the fact that you now have HSSE as the player it’s not easy to be 100% sure. I’m in the process of taking a project done with the 1.5 VSTi and porting it to HSSE/C6, but I keep getting drawn into playing with the possibilities of HSSE (in a good way!). The new player/GUI is a welcome improvment but above all the most important thing of course is the sound, which I personally find very, very good.
One of the main differences is that there seem to be much less presets (although I haven’t actually counted them) and the “tree view” method of selection via drop-down menu is replaced with the standard MediaBay selector. This has it’s own disadvantages in that the HSO patches are mixed up with the stock set from HSSE, but can be found by filtering on the word “symphonic”, which returns 111 patches.
But back to the matter of sound … HSO has always IMHO been more European than Hollywood and this version is no different, so it may suit some tastes but not others. For me, it’s ideal and although it needs investment of time, the results can be stellar.