There is a lot of misunderstanding going on here. This is not necessarily directed at you but just general misunderstanding of what all these conversions mean and are. This is the reason why the unit of conversion was set by the IEC.
A Gibi is binary prefix used in computer science and communications it represents 2 to the power of 30 but Giga in decimal system which we use in real life is 10 to the power of 9. That is why all your HDD, SSD, Flash, RAM Bandwidth is represented in the Decimal system because that is what we use.
Storage makers represent Gigabyte as 1 billion bytes and storage is increased in the power of 2 meaning 2, 4, 8, 16, 32, 64, 128GB.
To convert Gibibyte to Gigabyte, first find how many Gigabytes in a Gibibyte
(2^30/10^9) = 1.073741824GB so there are ~1.074 Gigabytes in 1 Gibibyte
Now lets translate that to PS5 and XSX
To convert Gibibyte to Gigabyte
PS5 = 768Gibibytes multiplied by 1.074 = 825Gigabyte
To convert Gigabyte to Gibibyte
XSX = 1TB = 1024GB = 1/1.074 x 1024 = 953Gibibyte to go back to Gigabyte multiply by 1.074 = 1023.5 = 1TB
This is why when you plug in a 128GB SSD in a computer you see you only have 119GB of storage and not 128GB but beside it you see the number of bytes as 127 billion. This is not accounting for other quirks that has to do with block sizes and how files are stored in each cell and block group.