Nope, what the Catalyst says is that whatever choice you make the Crucible distributes it using the Mass Relays destroying them in the process. So, to a very large extent all three endings have to be the same. I think a lot of people missed this nuance judging by the whole "three different coloured explosions" complaint.
Also, I thought only the Synthesis option would destroy the Mass Relays. As far as I remember it, the Catalyst only mentioned the destruction of the Mass Relays when talking about synthesis. So AFAIK in my "destroy the AI" ending the Mass Relays are still there.