I think the Jag isn't necessarily the same for all of those. I believe Rousis's animal is a Classic Jungle which is a random occurrence that is not inheritable.

If you're wanting to look into something genetic you will want to look into the Leopard Morph:

http://jkobylkareptiles.com/snake_room.php?id=36

Pastel Leopard @ T. Harbin's:
http://threptiles.com/collection.php?id=00035

The Leopard is linked to the Piebald gene, that may be similar to what Brian Gundy has though I do not believe his specimen looks quite as nice as Tom's and Justin's.