I'm a senior school teacher so I know about older students but I believe it is a bit different when they are younger... but

I believe at this age, the main difference with montessori is that children choose their own activities and pace of learning compared to the 'traditional' teacher/caregiver led activities. Really good for motivated learners but can be a bit hard on the shy kids...Its just a way of kids being 'in charge' of their learning rather than being told what to do.

I know what I have written is a bit vauge, I have baby brain quite badly at the moment, but I hope it helps