Heartnut grafting question

Is it possible to graft walnut scion onto heartnut seedling rootstock?

From what I understand, heartnut are faster growers than most wild black walnut rootstock.

Any downsides to grafting this way?

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Iā€™m not a grafter, but pretty sure you can graft any walnut to them. I have many walnut trees and you are right, Heartnut grows 2-3 times faster on my property.