Is the placement to the pronoun y similar to or different from the placement of the other object pronouns?

The placement of the object pronouns is different to other pronouns such as relative pronouns.

Explanation:

This is because object pronouns are used to replace a noun so you don't have to keep using the same noun.

e.g Je vais le trouver.

     I am going to find it.

Other pronouns such as relative pronouns are used to refer back to a noun.

e.g Bruno est un homme qui est tres courageux.

      Bruno is a man who is very brave.

I hope that helped you understand it a bit better.