I understand it is very important to sign the certificate during oath exactly the same as the application.

But what happens if by mistake it is signed a little different what repercussions could this have?

thanks

Who told you this? You do not sign the certificate at the Oath...you sign it whenever and wherever and however you want to...they actually recommended us to do it at home and practising the signature first (they even give you a practise paper at the Oath) because if the signature is not fully readable it invalidates the certificate. Therefore the answer is..no repercussion whatsoever.

You need to sign the certificate with full first and last name. Especially important if (like myself) you conventionally sign applications, ID, receipts with initial and last name.

thanks for the clarification.