cupra mk3 alloys ET

I have purchased a used set of Mk3 Ibiza Cupra alloys (5 star with centre covers) for my son's car. I was about to fit when I noticed that ET number stamped on them shows 2 different numbers ET 28 & ET38 ??

I have measured the distance on rear of wheel from inner hub mounting and inner wheel rim edge and they appear identical,so I assume they are actually the same fitting,possibly an error on wheels ?

Anyone seen these wheels with different ET ?

Thanks

http://i66.servimg.com/u/f66/14/76/86/69/04_sec10.jpg
 
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