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[PhilK]

From Google, and probably a little simplistic:

HYBRID: an organism that is the offspring of genetically dissimilar parents or stock; especially offspring produced by breeding plants or animals of different varieties or breeds or species; "a mule is a hybrid of a horse and a donkey" - so in pythons a hybrid would be a woma x carpet or similair

INTEGRADE: An animal which shows the mixed characteristics of two subspecies at the border of both their ranges - My understanding is that this is naturally occuring. For example, at the border of diamond python/coastal carpet habitat, intergrades can occur because diamond pythons and coastal carpets are subspecies of the same species (Morelia spilota)

Make sense?