Those should all be fine as they are replica Nerf guns, colour doesn't matter so much as the shape.
When it says colour doesn't matter in the regulations I believe it means even if a realistic looking gun is fluro pink it's still a replica gun because it's close enough, the same as Goki's Han Solo gun is "close enough" to a real model of gun so it requires a license.
If in doubt ask a police officer, call a support hotline or send an email with a picture of the toy and ask if it's ok to own them without a license.
A quick Google says Spearwood might be in WA, so you can find contact details to make inquiries at the bottom of this page https://www.police.wa.gov.au/About-U...vices/Firearms