Does anyone know if old and new part numbers for S60 D5 are interchangeable?

What I mean is: I have to replace EGR valve and I was told I need to change valve, acuctator and exhaus gas cooler. I thought that I could only replace valve so I asked Rufe for a quote and he said that all three parts have different numbers now and he doesn't know if the new valve will fit or work with old cooler. So does anyone know if they changed only part numbers or are the parts different in some way?

Since the cooler itself costs 300 I'd like to use the old one if it's possible.

greg