Zones definition for additional IPs (failover) movement

In this page I read:
https://www.ovhcloud.com/en/network/additional-ip/
"An Additional IP cannot be moved from one zone to another. For example an IP located in the SBG data centre can be moved to GRA or RBX%2C but cannot be moved to BHS."

So, it says I can move IPs between SBG, GRA and RBX and I have to guess they are in the same "zone", but I can't find a clear list of zones and which DC are included in this zone.

I currently have servers and IP failovers in an RBX DC and in my IP list I see a "region" column saying they are in "eu-west-rbx" region: I can't find "zone" specifications.

Now I have to buy further dedicated servers and I'd like to move to the german DC, but I can't find anywere if my IPs from RBX can be moved to a dedicated server in LIM (eu-west-lim).

Are "eu-west-*" the same zone? if so, why the IP listing in the manager shows me the "region" and not the "zone"?

Hello, the zones are the regions listed at the bottom of the page, e.g. eu-west-par or ca-east-bhs.
Additional IPs can only be moved from one AZ/Datacenter/service to another within the same region but not to a different region.
The only exception to this is for eu-west-gra, eu-west-rbx and eu-west-sbg. An additional IP can be moved between these regions.