[ASK] Can i flash C9603 .236 pre-rooted tft on my SO-01f (docomo)

Help please anyone,
I bought a Z1 Docomo with stock C6903 .236 installed on it.
Can I flash another C6903 .236 but pre-rooted? If possible, what to check on flashtool?
No kingroot please, I'm looking forward to be able to install busybox

Thank you

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