Nerf Refill Darts. Which to Get?

Just purchased my first set of nerf guns for myself and my daughter.

Looking to purchase some bulk refill darts and curious if there are any difference between these two options.

$15.99 75 pack from amazon AU

$9.60 for this 80 pack from Big W

If there is no difference between the two, i'll just buy a few of the refill packs from big w.