Difference between Readiness Check and Sizing values

Hello!

A lawsuit is going to migrate from:
ECC 6.0 to RISE S/4HANA Private Edition

We are evaluating however overmuch further representation we person to adhd to the people architecture.
The Sizing study indicates (Gib):
- Memory request 1,604.0
- Net information size connected disk 1,490.2

The Readiness Check report indicates:
Anticipated Initial Memory Requirement for SAP HANA 524 (in GiB)

We person fewer questions astir the Readiness Check and Sizing reports:

1) Which of the 2 information (Readiness Check oregon Sizing) bash I instrumentality to cipher the representation required for the migration?

2) Where does it bespeak successful these reports the magnitude of representation required for the pursuing SKUs:
FileSystem
File Storage
8008794 - Additional File Storage
8011367 - Additional Database Storage

3) Or however could I cipher FileSystem and FileStorage?

Thanks successful advance.