Is there a difference between the two Breville Pizzaiolo models?

I have had a Breville Pizzaiolo 820 for a few years, and have been happy with the results. Planning to get another indoor electric pizza oven for our beach house, and since kitchen space is limited and the house is small I am thinking of sticking with the Breville since the Ooni Volt is somewhat larger and heavier and we will need to carry it downstairs or into a hall cupboard for storage. 

My only complaint with the Breville is that I have had I believe 3 cracked stones…two with the older white ones and one with the newer black ones. I always keep a back up stone available, and I look at it as the unfortunate “cost of doing business” with the Breville. 

However, does anyone know if there is any difference between the steel model and the black truffle model? Any updating on the later model? On the Breville website (and elsewhere) the silver model is $799 and the black model $999. (Seems like a significant price difference for a different color.) Also, under accessories there are two different 12″ pizza sto…