The difference is in absolute value.
5°C = 41°F as an absolute value.
As a DIFFERENCE value, 5 Celsius degrees is roughly equivalent to 9 Fahrenheit degrees...............
Example:
20°C = 68°F
25°C = 77°F
Ergo
A 5°C DIFFERENCE = a 9°F DIFFERENCE...............
I don't want someone thinking that the Oprah-fish can raise him/herself to cookin' temperature, is all. The amount of difference is significant, but relatively slight.
Thank you for educating us out here.