https://en.wikipedia.org/wiki/PlayStation_4_technical_specifications#APUI'm not talking about "spec" equivalent but performance equivalent for both AMD and Intel.
I know that the PS4 Pro GPU is about a gtx 1060.
A quad core Ryzen or i3 would be a good option.
Personally I wouldn't bother trying to run most PS4 titles with anything under something like a i5-4690 or the AMD equivalent. Anyone who's tried cross-platform titles with high or even medium settings on an i3 will know what I'm talking about.