Can't definitively know,

I don't think each airline in the oneworld alliance negotiates reimbursement rates https://onemileatatime.com/insights/...d-ticket-cost/ with each partner (that would be a messy negotiation!) - rather, each operating airline unilaterally sets the rate and everyone else are price takers (maybe the rate is subject to some moderation, but not necessarily). It then is up to each FFP to set the partner mileage cost for its own members, and whether to allow redemptions.