Diki, I have run across several sounds that definitely do not have the same quality of the same patches on the G70..especially in the mid range..Some tones , can hardly be heard in the low range on the E-60 where they are fine on the G70..I think Roland has left some sounds as close as possible to the G70, but across the board [pun intended]..The G70 sound bank is superior...
If you didn't have the boards side by side and scrutinizing every key at different velocities..you would not know there to be a difference...

I have the program change from the G70 to the E-60..selects the same or similar patch and made it easy to compare them..After 500 patches or so...my conclusion is the wav sample rom is definitely smaller than the G70...but they did a heck a of job on this board..