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Comparing two datasets for consistent difference?

I have to compare the difference between two datasets made by subtracting four lists w,x,y, and z : w-x and y-z. I have to show that the difference between w and x is in the same range as the difference between y and z. The w-x dataset is 12 data points with an average of 24, and y-z dataset is 365 data points with an average of 27.

How can I statistically compare the two datasets and show that the difference is in the same range?

w and x are lists of monthly electricity demand values and y and z are lists of daily demand. I have to show that the difference between y and z follows a similar trend as the difference between w and x.