Does GFP-710 sound better that older GFP-565

I am currently using an Adcom GFP-565, which, if not mistaken, was Adcom's top-of-the-line preamp when it came out. I recently, on an impulse purchase, obtained the current GFP-710, which is one model under the 750. Is there any reason I should think that because this preamp is much newer, that it would sound better than (or even as good) as the older high-end GFP-565?

Thanks,