You are never going to count up all of these chances by yourself, but computer programs can give you these numbers instantly. In real money, WA is worth about 1 more than WK when you play for quarters. The 6 and the 7 were of different suits than either the A or the K, and neither was close enough to belong to a straight which includes either the A or the K. Let's see how some of these things matter. Flush interference affects the A and the K equally. It's harder to draw three hearts when there are only 11 still in the deck than when there are 12.
Straight interference is interesting.
And, obviously, two low straight cards have a bigger effect than does one low straight card. The complete rule about how to play the WAK hand will have to wait until next week. This complete rule will take straight and flush interference into consideration. For those of you who don't want to think about all of these complications, just play the WA in these hands. You'll be right most of the time, and when you are wrong, it won't be by much.