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Even though the units are different, an increase of 1 unit Kelvin is equivalent to an increase of 1 unit Celsius. Since this equation uses delta T rather than just T, you can use the same number without having to do any conversions.
If the temperature raises from 25 to 27 C, by converting to K it is being raised from 298 to 300 K. However, the change in temperature for both is still 2. Therefore doesn't matter if you use kelvin or Celcius to measure delta T (unless you need to cancel out units later in the problem).
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