So is Metroid: Other M Samus' origin story?

[Cheebee]

Is that woman with the blond, short hair you see at the beginning actually Samus? Because right after that you see someone who's definitely Samus, in her Zero suit, but who looks very different from that short-haired girl.

Also, at the end, you see another blond woman, who looks like a doctor or something, when Samus is in her suit and says 'I'm Samus Aran'.