I was told that this is a normal variation in quartz counter materials, because the lighter piece is from an island slab and the darker is regular countertop. Is this really true?
Update: After a lot of back and forth, the GC has agreed to change the darker (counter sized) slab. I will post pics when it happens. Thanks again for the input- it was very helpful. The GC was so adamant that this was normal that I thought i was going loopy!
On another, related note, he says the installer has never replaced one part of a counter before, and is worried about the seam and even destroying the other slab. Surely it can't be that hard?