Porsche parts equivalence list

[NewArt]

I am aware that Porsche sources many car parts from other brands: BMW, Audi, and VW to name 3. For instance, the lifters used in my 986 S are apparently the same as found in the BMW parts bin. My question is, does anyone know of a list or resource to find the equivalent part number? For example, the lifters at Porsche are part number 99610504172, so the corresponding BMW # is apparently 11 32 1 748 884. "Flyingpenguin" on the Renntech forum said "Lifters in question (for M96 2.5, 2.7 and 3.4 engines, not sure about 3.2's) are less than half price vs.OEM at European Auto Parts - Wholesale Genuine and OEM | Saab BMW Volvo VW Mini Audi Porsche Mercedes Benz last time I looked. Their part# is 11 32 1 748 884."
I was mostly curious to see if there were other parts which were common to other brands and if perhaps a list could be compiled by enthusiasts who like to tackle some rebuild/upgrade projects and keep the costs in line.
Thanks for any info you might have!