A method performed by a harvesting machine control system, the method comprising: obtaining bias data indicative of a performance bias of a first harvesting machine relative to at least one other harvesting machine comprising a second harvesting machine; receiving a settings input indicative of a request to set performance of the first harvesting machine to correspond to performance of the second harvesting machine; based on the bias data and machine settings associated with the performance of the second harvesting machine, determining adjusted machine settings associated with controllable subsystems on the first harvesting machine; and outputting a control instruction to the first harvesting machine based on the adjusted machine settings; wherein machine setting bias data representing a settings offset between the first and second harvesting machines are calculated using the bias data; and determining the adjusted machine settings comprises applying the machine setting bias data to the machine settings of the first harvesting machine and the machine setting bias data are calculated based on position-referenced data associated with the first and second harvesting machines comprising the steps of: identifying a set of corresponding zones based on the position-referenced data, the zones referring to work areas in which the machine is operating, identifying a first set of machine settings that is associated with a first one of the zones and corresponds to the first harvesting machine; identifying a second set of machine settings that is associated with a second one of the zones and corresponds to the second harvesting machine; characterized in that the machine settings bias data are determined based on settings differences between the first and second machine determined when the first and second machine operate in substantially similar zones and with similar performance and in that the machine settings bias data are determined based on settings differences inferred to get similar performances of the first and second machine when the first and second machine operate in substantially similar zones, with similar settings and different performances. obtaining bias data indicative of a performance bias of a first harvesting machine relative to at least one other harvesting machine comprising a second harvesting machine; receiving a settings input indicative of a request to set performance of the first harvesting machine to correspond to performance of the second harvesting machine; based on the bias data and machine settings associated with the performance of the second harvesting machine, determining adjusted machine settings associated with controllable subsystems on the first harvesting machine; and outputting a control instruction to the first harvesting machine based on the adjusted machine settings; wherein machine setting bias data representing a settings offset between the first and second harvesting machines are calculated using the bias data; and determining the adjusted machine settings comprises applying the machine setting bias data to the machine settings of the first harvesting machine and the machine setting bias data are calculated based on position-referenced data associated with the first and second harvesting machines comprising the steps of: identifying a set of corresponding zones based on the position-referenced data, the zones referring to work areas in which the machine is operating, identifying a first set of machine settings that is associated with a first one of the zones and corresponds to the first harvesting machine; identifying a second set of machine settings that is associated with a second one of the zones and corresponds to the second harvesting machine; characterized in that the machine settings bias data are determined based on settings differences between the first and second machine determined when the first and second machine operate in substantially similar zones and with similar performance and in that the machine settings bias data are determined based on settings differences inferred to get similar performances of the first and second machine when the first and second machine operate in substantially similar zones, with similar settings and different performances.