Reply to ""not a" vs "not any""

Hi there, do both not a and not any sound natural In the following context? Are they both grammatical? And if I use 'not a' in an exam, will I be marked down?

  • Parliament elections in india are near. Today an opinion poll was held that says Abc party will win 250 seats, Xyz party will win 100 seats and others will not win a seat/any seats.

As both mean others will win Zero seats so I think both forms are correct. Could you please explain?

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