Are you meaning the Aldi Harvest Morn? If so, I believe you can have 2 of the 'less than 70 cal' ones (choc orange, apple sultana) as HEx but I'm pretty sure the regular ones can't.
To qualify as a HEx it's not just down to calories - it's all to do with the proportions of cals, fat, carb & fibre so some seemingly low cal bars might look as though they'd be OK but they might not have enough fibre to qualify as a HEx