Equation from ogame.fandom.com:
Production = Universe speed * ( 10 * Deut. Synthesizer level * 1.1^(Deut. Synthesizer level)) * ( 1.36 - 0.004 * average temp. )
We both get the same production, since 1.36 - 0.004 * average temp. [1] is equal to 1.44 - 0.004 * max. temp. [2]; because average temp. = max. temp. -20°C.
Proof:
[1] https://www.wolframalpha.com/i…9%3D1.36-0.004*%28x-20%29 (See: "Expanded form.")
[2] https://www.wolframalpha.com/input?i=f%28x%29%3D1.44-0.004*x