I had to convert KM to US miles, so I could be sure. 124,000 miles doesn't seem too bad, particularly since we're talking the European model. If the maintenance is complete and documented, it's probably fine. If it had been a North American model, I'm not sure I'd answer the same way...
Here's a list of the differences between the two models. Could you explain which of them would make the European model more durable at high mileage?
-premium audio by Fender-Panasonic instead of Dynaudio
-no HID xenon headlights
-no LED taillights
-about 10 cm longer wheelbase and body than Euro Passat
-fuel door release button removed, you now push on the fuel door flap (w/doors unlocked) to open
-manual instead of electric parking brake
-umbrella storage inside door removed
-The headlights/taillights/ bumpers are a different shape.
-The NA Passat has a little lip that makes the car smile, the Euro Passat has more of a frown. The edge of the lower grille also ends curved up instead of down.
-The NA Passat's bumper seam goes straight back from the headlight, the Euro Passat goes down. The top and bottom rear of the front fender is also different.
-The front window ends in a point in the NA Passat.
-The chrome trim is different and lower in the Euro Passat.
-The rearmost window is a totally different shape.
-The rear door is a totally different shape.
-The US armrest sticks out. The armrest of the Euro Passat is flush with the area underneath it.
-I can see a homelink transmitter in the driver's side sunvisor on the US Passat.
-The kickpanel trim is more pieces on the US spec car.
-The design of the NA dashboard and gauge pod is similar to the other US Spec VW. The Euro Passat is similar to the last mk5 Passat.
-The side view mirrors a different shape.
-The power side mirror adjustment is in a different location.
-The side window blowers are in the dashboard instead of in the A-pillar.
-The NA Passat has a door unlock button on the pass side.
-The door cards and center console are totally different. By this point I gave up trying to spot the differences because there are just too many. They're different cars.