Supplier used wrong attributes

Hi,

i imported a product and noticed the supplier user for the wrong attribute Material instead of Model.

Material: for Iphone 4 4S, for iphone 5 5S, etc...

question1: doest it make sense to move this values to the attributes model?

question2: if i rename the attribute names (values: for iPhone 4S) from englisch to german, will that be changed back after a product update?

thanks in advance
 
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