You are correct. Swept area is the most important thing. The area of the newer pad is more I believe.
I laid it out in CAD, based on the BAT catalog, which is 1:1. It seems that the newer pad is about 5-10% more swept area.
This is just a swag. However, I am sure that the newer pad is at least equal to the old pad in swept area.
Later,
Patrick
