Zo...No! These are two separate libraries...a few legacy patches have been retained which are listed in the articulations list. All new drums, brunnel loops, and an entire eDNA engine full of insane tweaks ( you have eDNA so you'll understand) and a much larger all new orchestral sample set...100+ players vs 50ish.
I hope they'll add a bunch new ostinatums but this isn't mentioned anywhere
If you are space limited you can always move A1 to an inexpensive external usb3 drive also useful for backing up songfiles.
Project M...agree with Carl... For example, ur EW has solo instruments while One is only ensemble...ie, groups/of players...
If course a lot depends on what you do...i rarely touch ew stuff anymore but for those sorrow filled violins, gypsy or platinum is perfect...