1+ is subsidiary of oppo so ofc they would use the same coloros, as for the oxygenos its just a market name for different market country, kinda like funtouch for global and originos for chinese market from vivo
They're identical apart from network bands. Reno 11F is the global version of the F25 Pro so has additional bands for global network connectivity where the F25 Pro is region specific.
First its not OS but UI.
Second own OS hot Huawei and we know where it ended since many bans from Americans.
If chinese put same bans on Apple they could ruin.
Lastly there are phones even with 32GB ram and a 11TeraBytes of storage but who c...