Don't know about the parts thing but you can call and ask.

 

Here's what I do. I get the list of scheduled maintenance for both vehicles I'm comparing and mark off what's been done and work that may be need going forward for the estimated amount of years I think I'll own it ie 4 years. Ie if it says at year 10 do XYZ I get a price for XYZ from a dealer or independent for best case scenario cost comparison and repeat for year 11/12 etc service
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Thanks!

 

That's right, Jason Giannetti is the man !!
It's not so much any cross reference to Audi Volkswagen as Bentley parts are much more heavy duty than the regular Audi parts, like axles, suspension parts, the Bentleys are much bigger, even the wheel bearings are a different size than an Audi A8L W12, they do not match.