dealer replaced seat cover - now it doesn't match - 2001 w210

[e320wagon4matic]

The seat heater (lower cushion) failed on the '01 wagon, so the dealer (under warranty) replaced the heater element/seat cover. Now the seat cover looks quite different than the rest of the seat covers.
The car has the full leather option (unlike '01 sedans, '01 wagons came standard with only leather seating surfaces - full leather was an option). The original leather is quite smooth and shiny - really has an awesome feel. Even the pockets on the seat backs are full leather (unlike the "full leather" in the '02 c320). But the replacement seat cover is a heavily textured "dry" leather material with no surface gloss. This is not a case of the original being "worn" smooth - the materials are quite different.
Is this just natural variation in the leather cover, or has the dealer installed a "leather seating surface only" type cover? The part number they installed for the cover (from the invoice) is 210-910-58-46-9B50.
Thank for any advice/experiences anyone can share - I'm trying to decide if I should complain, or just ignore it and move on!