This is true, but there is a consistent identifier cross account (likely to make it possible to build multi-account architectures without having to measure network latency between zones manually) - this is the AZ ID instead of the AZ Name [1].
[1]: https://docs.aws.amazon.com/ram/latest/userguide/working-wit...
"To ensure that resources are distributed across the Availability Zones for a Region, we independently map Availability Zones to names for each account.".
my eu-central-1a is not necessarily yours.
[0] https://docs.aws.amazon.com/ram/latest/userguide/working-wit...