Hi, have you tested this yet to see if they are a straight fit? Thinking the same thing myself
 
I had OEM 18" Audi S-line 7 double spoke wheels on my Cupra, they did fit. Offset was ever so slightly narrower so I used 10mm spacers at the rear. I now have the same style but Replica wheel in 19" and offset is perfect.

 
Yeah the ET is what you're going to want to look out for. Wheels on the Audi A5 I believe, have an ET of 29, whereas the stock Cupra alloys are 50 or 51. The Audi A5 wheels will most likely protrude from the arches. I know you mentioned only the A3 and A4, but they're not always the same.
 
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Vw group 5 studs hubs are all the same, you may get different offsets for 4 wheel drive possibly.. But the pcd's the same

Hence Audi rs6 wheels find themselves on golf's quite often, not that I'd like to buy tyres for them..
 
Vw group 5 studs hubs are all the same, you may get different offsets for 4 wheel drive possibly.. But the pcd's the same

Hence Audi rs6 wheels find themselves on golf's quite often, not that I'd like to buy tyres for them..

The newer Audi cars (iirc 2009+) have switched to a 66 centre bore
 
Vw group 5 studs hubs are all the same, you may get different offsets for 4 wheel drive possibly.. But the pcd's the same

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Thats not true I'm afraid.

Vw 5 stud hubs / wheels come in 5 x 100 and 5 x 112 form. This means that wheels from these vehicles are not interchangeable.