When changing the domain, is the position of the site and its links lost?

Question

Search Engine Optimization

There is a site in the .com zone / for various reasons, you need to move to com.tn (for example).
1) is it possible to indicate that they are both the same site?
2) If yes, will all .com site links be considered the same for com.tn ?

Answer 1

You will have to raise them in parallel, assign them as mirrors, wait for indexing, and then remove the old domain.

Answer 2

You just need to set up a 301 redirect on the old site