[mothered]

No they haven't associated my account to that one

You don't know this for sure- only they do.

I'm trying to clarify whether both accounts belong to you "under the same credentials", or whether "every Identifiable detail has been changed".  Is It the former or the latter?

Sorry I do not understand what do you mean.

I took a lot of precautions to not make Amazon linked my .it account with .de.
I'm sure it's not linked. As I said before I changed all:
- italian ip
- no cookies at all on the browser
- shipping address in italy
- different browser
- different email (created with anonaddy)
- phone number (based on UK)
- credit card that correspond on the name of the account

There is no intersection with my information on the .it account

Did you also change "every Identifiable detail" on both your accounts? Name, address etc?