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You don't need to convert it when you're only using the difference in the temperatures in your equation because the differences will be the same. You need to convert when you're using a specific temperature (not the change) and when you are trying to find a ratio between initial and final temperatures.
Almost always it's preferred to use Kelvins to do the problem (and then convert the final result to celsius if the question specifically asks for it). The only instances where celsius is fine is when CHANGE in temperature is used in which there is no difference between the two.
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