ref – https://www.geeksforgeeks.org/g-fact-86/#:~:text=Auxiliary%20Space%20is%20the%20extra,and%20space%20used%20by%20input.

Auxiliary Space is the extra space or temporary space used by an algorithm.

Space Complexity of an algorithm is the total space taken by the algorithm with respect to the input size. Space complexity includes both Auxiliary space and space used by input

Hence, Auxiliary Space is a subset of Space Complexity.