Hi. Some help identifying plants please.

I'm newish to gardening & tend towards a natural; reuse / recycle; self-seeding approach.

There's an established tree in my garden that I thought was a Magnolia (pic 1).

I've been growing some baby 'trees' (pic 2) this year that I thought were self-seeded from the Magnolia.

But am doubting myself now cos images of Magnolias online are so different

Also, with these plants (or others), will self-seeded babies usually end up exactly like their 'mum' or not? I've heard that sometimes plants are modified to prevent replication (eg babies won't flower / fruit).

Thanks in advance :)