Around Heathrow at least, there seem to be a few paths where Airbus and Boeing both fly, but seem to be reporting slightly different offsets within that path.

Around Heathrow at least, there seem to be a few paths where Airbus and Boeing both fly, but seem to be reporting slightly different offsets within that path. I wonder if that's a systemic difference in how they report their GPS position to ADS-B, or an actual real difference caused by slightly different autopilot systems, or something else?