It is more likely that the same company that printed the W575 cards also printed the cards to be distributed by Koesters so the same screens, stock, ink and images were almost certainly used. There could be some differences in the printing, but it is likely that unless new poses or positions were used, the cards are probably as identical as other cards from the series with identical fronts and just different backs.
Rhett is the walking encyclopedia on this stuff and his knowledge on these sets is really unbelievable (especially since it is ALL from memory and he does not use Price Guides or other peoples research and catalogs) so I am not speaking for him. That is just my understanding on how these cards were made.
Rhys
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