How do I count number of values in row2 that doesn't exist in row1?

I have two rows with values and blanks at the end (but I don't know how many blanks). For example,

Row1: A C E G * * *
Row2: H A C F I * * * *

* is blank
The values could be either text or numbers (but not both at the same time).
Each individual row has unique values (no duplicate values in each row).

1. I would like to know how many values there are in Row2 that doesn't exist in Row1, ignoring the blanks. In the example above, there are 3 values in Row2 that doesn't exist in Row1 (H, F, I).

2. Alternatively, I would like to know how many of the values in Row1 also exist in Row2 (this is actually the final result that I need and it can easily be calculated from # of values in Row2 - result above = 5-3=2 ).

Could someone propose a formula for this?
TIA!