Bamboo Cloth Diaper Inserts for Pocket or Cover Diapers from Nora's Nursery - One Size Fits All (10 Pack, Soft Bamboo)

What's the difference between these and Alva baby inserts?

I've been using Nora's Nursery diapers and pads since my son was born and he's almost two now 🥲 When should the pads be replaced?

Would these fit in a newborn cloth pocket diaper?

Are the inserts flushable?