I'm a sucker for the neatness of the square.

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Thank you for some concrete information. Those samples could actually be different batches of the one colour. The flecks and shading are almost identical. Is the new version the low silica option following legislative changes? If so, you’ve been caught up in a change that was beyond the Manufacturers and your control. It would also explain the same name being used, something typically not done because it causes problems. PS you assumed I’m a guy. I’m not but I do have 25+ years of dealing with contracts, vendors and projects. Half my life is spent trying to get suppliers to do things they may not want to do, and it all comes back to the paperwork particularly the disclaimers and exclusions. I can’t see any resolution for you.

Got my answer - non combustible material such as, natural stone - marble, granite or concrete etc.