Which Live Flight Tracker do you mean?
The AirNav Free Live Flight Tracker is a separate and free Google Maps based tracker. There is no interaction with RadarBox.
www.airnavlive.comRadarBox is a far more comprehensive and capable package - that's why it isn't free :-)
The AirNav Live Flight Tracker pay version is an older product than RadarBox and if I remember correctly, it is a subscription service that costs more that the RB subscription (which is free for the first year). The RB package picks aircraft up with its antenna and seen Network data, but Live Flight tracker only sees Network data.
Again, there is no interaction between RB and Live Flight Tracker.