Change 318TDS engine for a 325TDS

Hello, I am new here, and in the first place to send greetings to all of this community.
My question is whether someone has changed the 318 TDS engine for the 325 TDS, or if someone knows about this, I mean issues of homologations, documentation, etc. If someone can inform me I would be very grateful, anyway thanks in advance. Greetings.

BMW's manuals have them on the page, the homologation I don't think you are talking about standing up in Spain, I don't know how you have it ...

Thank you for your answer, but what I need is to know the documentation procedures so that my 318 TDS passes the ITV with 325 TDS engine, and everything is approved here in Spain. I have read for some forums that depends on the percentage of CV that increases, if it does not exceed 30 percent and things like that. Thank you again and greetings.

Hello,
I don't know if you know him, but you can enter the BMWFAQ forum and it sounds to me that someone finds something similar or will give you some idea.
greetings