Exhaust muffler fitment between years/models.

[PLP]

I searched the forum. Yeah, it was maybe more of a skim search than a deep one.

Anyway, most common question was: is 2.7 muffler exchangeable with 3.2.
And I found yes, it is.

My question is - is there any difference between the years?
I found different part numbers for 2000-2002 and 2003-2004.
Looking on the picture they seem to be same... but this is only some graphics.

So, what is it?
Will 2001 base work on 2003 base just fine? And why there is a difference? Was the exhaust design related to different engine mapping? The 2003 got a tiny power bump.

What basically is happening - I have 2003 base with Pedro modified muffler. I want to go back to stock.

I just tried inserting wine corks into the pipes (as a temporary plug) and the noise is much nicer. Well, to me at least.
I would give it away to someone who will give me the stock back. But then - would that work fine between the years... and models.

Thanks in advance.