Count when Dates match between 2 columns

Hi Team,

I am working on a Power BI matrix visual and there is a challenging ask to calculate the count of dates matching between 2 columns and % for it.

Sample Data:

Color coded for easy reference to hightlight the dates matching:

I am trying to calculate the following for Parent Xyz,

1) COUNT(DATES) for Column A (excepted result is 20)

2) COUNT(DATES) for Column B (expected result is 8 )

3) Matching DATES % between Column A and Column B (expected result is 6/20 = 30%)

Power BI Experts, please weigh in your thoughts to create the measure(s) to solve this.

Thanks in advance!