The new ones are zen+, so about 5% faster per clock due to cache improvements. They are also 12nm instead of 14nm. The other zen+ chips shrunk the transistors,

The new ones are zen+, so about 5% faster per clock due to cache improvements. They are also 12nm instead of 14nm. The other zen+ chips shrunk the transistors, but left gaps between them so the physical size was the same, but with a GPU shrink, a few more months, and all the 3xxx mobile chips also being zen+, they may have gone ahead with a physical shrink too.