Thanks for reply.
They sound strikingly similar, however having played the tones back to back, perhaps the vibrato is a bit faster on the 'Advanced', it's not super obvious, I don't understand why only today I've noticed them being so similar. Can you tell me if it's something that you have to listen hard too (to notice the difference)?
I don't want to go through the process of returning product if it's just how it is.