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I have yet to see a manufacturer's catalogue which was based on known kW/sq.m. They manufacture rad in four different types (P1, K1, P+ and K2) to standard heights and standard lengths. The catalogue tells you the output and you are left to choose the rad which is nearest (higher output) to your requirement.how do you think the manufacturer prepares his catalogue, if not from known kW/sq.m? And the catalogue would be based on specified flow and return (and possibly room) temperatures.
Of course the data is based on specific flow, return and room temperatures. If it wasn't, the rads would not meet the standards laid down by BS EN 442.