Yes, they changed a few things, mainly exterior stuff.
- Rudder is squarer, especially at the bottom of the trailing edge.
- Fin fairing is longer and higher.
- Larger window at the rear of canopy.
- Rear of canopy different shape.
- Windows on top.
- Gross weight is augmented to 4002 lbs!!
- Some of the FwP.149Ds have a thrid seat belt at the rear...
Focke-Wulf did a batch for Swissair with electric flaps and a stab higher on the tail. They are called FwP.149CH.
Uganda bought a bunch of refurbished German ones, FwP.149Us they are...
It's very interesting to learn about this little aircraft!