It should work like that. Regular spell haste (enchanter, shaman, classic bard, etc) is slot 1. Burnout haste is slot 4. That means they don't block each other, so a mage pet can have the superior enchanter haste without losing the other burnout buffs.
On the other hand, they are both the same type of haste (spell haste (Haste v1)), so the haste amounts won't stack. Only the highest haste buff will take effect.
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