Can the symptoms of panic attacks be mistaken for the symptoms of hypoglycaemia?

Panic. Sure. Eating crackers and running blood sugar levels and history of diabetes on medications can differentiate the two.
Yes. There is a good deal of symptom overlap between a panic attack and symptomatic hypoglycemia and one could fairly easily be mistaken for the other. Also, don't prematurely rule out the possibility of both conditions co-occurring.