Personally, I feel it would be 'clashing of the monograms'. I would do another scarf though without any branding.
I say try it, and see if it grabs you. That said, mono on mono might be a bit much but that's one of the reasons why damier is so great, it goes with everything. Anyway, your opinion is the one that matters! My mono Speedy is wearing a purple Pucci scarf today, I guess I was feeling inspired by the warmer weather here in southern California.
Personally, I feel it would be 'clashing of the monograms'. I would do another scarf though without any branding.