From the current edition of Pianobuyer: "The GB1K has simplified case construction and cabinetry, no duplex scale, and the middle pedal operates a bass-sustain mechanism. It does have a soft-close fallboard. It is currently the only Yamaha grand sold in the U.S. that is made in Indonesia."
From the 2002 edition of the Piano book: "A GE-1AS model has duplex scaling, a slow close fallboard, and NEOTEX keytops." The GE model also has agraffes and was built in Japan.
In the 2002 Piano Book there is some discussion about how the small entry level Kawai grands compared to the entry level Yamaha grands of the time. Kawai seemed to have an edge from a musical standpoint. HOWEVER, this was the situation in 2002 - not 1996. I have no idea how the specifications of the Kawai GE model of 1996 compared to those of 2002.
The Yamaha is 22 years newer than the Kawai. If you like the feel and sound it probably is worth the extra $2K investment. The fact that it was built in Indonesia shouldn't be a major concern. However, if the Kawai is in pristine condition, and if you can verify that it has a full sostenuto pedal, agraffes, duplex scaling and slow close fallboard, it might definitely be worth considering. ALSO - it might be possible to negotiate the price of the 1996 Kawai down a bit.