I think you could do either, however I would side more towards a pattern on this bc your room has a lot of beiges and not a lot of color variation. If you decide to match the chairs to backboard, i would change some of your decor to have a bit more color variation, such as the curtains or rug.

No definitely different fabric for chairs

Or you could add a pretty patterned bed cover/ duvet.

There is no right or wrong answer. If you want a matchy matchy look - do the same fabric. Personally, I would do a different fabric. Stripes are always a great option - they never go out of style and they go with everything.

I need to see the bedding but in my head no matching chairs

Chairs should complement and not be the same material.

When i analyze really striking rooms, whatever the style, they do not match. The art of a talented designer is balancing various elements so they complement each other. Poorly designed rooms either are completely bland because people were afraid or unbalanced and jarring.

Left to my own devices, my design choices would have wound up either being too safe or being too jarring - sometimes in the sake room. 😂 Working with my designer has given me a lot of insight into how they bring everything together. i will offer siggestions that aren’t quite right and when she explains, I understand. Not that i can duplicate it but the design process makes more sense.

The entire room seems to be a study in calm and understated neutrals. I think the chairs would be an opportunity to add some interest with a coordinating bold pattern.