The core part of it is unchanged. All CPUs with the Zen2 Architecture are made out of the exact same 8 Core die. Ryzen, Threadripper and Epyc. And that is one of the big advantages that AMD currently has compared to Intel. Take a look at the pictures. The CPU actually consists of 3 Parts: CPU, GPU, Interconnect.

What's new with this CPU is the GPU Die that is soldered right next to the CPU and the interconnect chip that combines CPU and GPU.

It should have been:

Ryzen 1000 - Zen1

Ryzen 2000 - Zen+

Ryzen 3000 - Zen2

But it is:

Ryzen 1000 - CPU: Zen1, APU: -

Ryzen 2000 - CPU: Zen+, APU: Zen1

Ryzen 3000 - CPU: Zen2, APU: Zen+

Ryzen 4000 - CPU: ?, APU: Zen2