The miles/points/avois of different ffp's are not equal or a set ratio.
QF is not generous when earning on other airlines. Generally if it was a QF flight would earn more.
The cost to burn is not the same.
A guide for the award cost LHR-JFK one way in economy (but check with the QF-BA web sites.)
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LHR to JFK Award Pricing Calculator | AwardAce
QF 22500 points plus taxes & surcharges (14 LHR-JFK flights to earn)
BA 13000 avios plus taxes & surcharges (3.7 LHR-JFK flights to earn)
The surcharges will be different
Another route would give a different answer
QF points expire if no activity in 18 months