For the same or similar enzymes from two different organisms, always remember that the exact amino acid sequence will be different. In some cases, depending on how different the two organisms are from each other, the percent identity may only be around 50%. In other cases, it may less, or even more! But, even when there is considerable non-identity in the primary sequence of the proteins, the overall three dimensional shapes (tertiary structure) ...
The solution comprises of a detailed explanation of why similar enzymes can have such different thermal properties.