Would creatures, evolved to tolerate the consequences of mouth breathing, be able to gain more oxygen?

In this world, there are certain genetically engineered creatures, that are able to tolerate the side effects of mouth breathing (like sore throat) without increasing the normal air resistance in the mouth and throat.

Considering that they can breathe through their mouth with no negative effects, would they be able to gain more oxygen (e.g: the same amount of oxygen gets into their lungs under shorter time or vice-versa when compared to nasal breathing)? Would that bonus be significant, considering that their lungs are large (not a limiting factor)?

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Would creatures, evolved to tolerate the consequences of mouth breathing, be able to gain more oxygen?

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