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Sorry I’ve posted about this before but now ready to order a radiator. These are 2 different calculations from 2 different sites. BTU 6005 from one site. BTU 4829 from another site, 4829 went through a lot more thorough questions, so I’m guessing the 4829 BTU is correct over the 6005.
If the radiator is slightly oversized it should not a problem as the controls for the heating system will restrict heat when the conditions are satisfied.

For example when your thermostat has reached the set temperature it will tell the boiler to turn off. TRV's (Thermostatic Radiator Valve) on the radiation would work on a similar controlling the heat around the radiator. When that are reaches the set temperature the valve closes.
 

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