Ok, guys, funny thread!
I don't want to say, one is better than the other. They are different, but only a little.
The 2325 has all the Dolby stuff in, that the 2330 (at least the european version) doesn't. The US Version has Dolby FM, right?
Then: The power amps are different. It think, the 2330 design is more modern, but the 2325 for me has the better built quality. E.g. On the power amp driver board the heat sinks on the 2325 are very thick and screwed onto the board. on the 2330 they are thinner and only plugged.
Pre amp, phono amp are the same. Power supply is very lightly different.
2330 has another AM FM Front end with a both in one variable capacitor, while the 2325 has two variable capacitors. One for FM and a separated one for AM.
My 2325 has more deep bass than my 2330. I cannot say, one is sounding better than the other. They are a little different.
Inside view.
2330, where the hole is, the US-2330 has Dolby FM. But the EU one has a second Phono input!
2325: