The new 3000 series of Ryzen APUs (codename Picasso) is now manufactured in an slightly improved process (called 12nm) and uses the slightly reworked Zen+ microarchitecture for the CPU cores. Therefore, AMD states an 8% increased performance compared to the first generation.
https://www.notebookcheck.net/AMD-announces-the-2nd-generation-of-Ryzen-Mobile-laptop-processors.391771.0.html