Combining different colored Hemnes shelves?

I purchased the red brown Hemnes bookshelf with the glass doors quite a while back. I had intended to shortly after purchase another, maybe a smaller one + one with no doors to flank it or something of the sort, but found they had already discontinued the color. Curious if anyone has suggestions or examples for pairing differently colored Hemnes that could still look good? I don’t particularly want to restain or paint, though maybe that’s my only option.