This same setup was asked about elsewhere on the forum, and I agree with JeremyT’s response: [quote=“JeremyT, post:2, topic:7100”]
You should be able to control four DC motors with two VNH5019 shields using your Arduino Due. However, I am not sure how easy it would be to stack them and remap the pins. It might be easier to use the pins that are broken out on the left side of the board…
[/quote]
That is an older post, so you might also try searching our forum to see if anyone else has posted about their experience stacking the shields. One phrase you can search for is two VNH5019.
-Jon