Ich denke mal Benchmark bedeutet doch etwas ziemlich davon Verschiedenenes, nämlich Höchstmarke, Vergleichsmarke beim Messen der Leistung eines Geräts. Der Unterschied ist also keineswegs subtle.

The 'Kitemark' is a product certification mark that is issued by the British Standards Institute (BSI) as proof that a manufactured product complies with a published specification. It appears on products as a black, kite-shaped logo. The BSI works with manufacturing and service industries, businesses and governments to facilitate the production of British, European and international standards. The BSI also publishes and updates these standards.