Hardware migration from IBM Power to X86

Hello Experts

We are looking at the option of moving our existing HANA landscape (Hybris, CAR and Treasury S/4 HANA) from presently running IBM power 8 systems to x86 intel platform. My question is while considering the sizing

1. Is it ok we consider the same SAPS and memory as that of current IBM power system.

2. Based on the Hardware manufacture change will the sizing differs. I am having this doubt due to architecture difference in power and intel technology.

Regards

Harish