Basic variance between two columns.

Hi Power BI Experts,

Loaded up two data sets, both identical in fields with exception of one columns values.

Same as how you would do in excel, I would like to do a column with a variance values 1 to values 2 to understand the difference between the two?

Tried creating a column, measure, relationship etc but receiving multiple errors?

Should be a simple = data1 column x - data 2 column x? No?

Thanks for help.