Yeah see, the serial umber tells you exactly when it's made (to the month). If it's made later in the year then it can be the next years model. The actual year model depends on the decals. but they can easily be changed on Zaskars due to no paint/clearcoat. So to put it as a year model you can oly go by the original decals, you can guesstemate by the serial number by saying liek anything after september could be a next year model.
91,92 have the Zaskar on the down tube
93 has a solid zaskar on the top tube and GT all terra on the down dube
94, 95 are pretty similar wit GT all terra on downtube and solid zaskar with some detailing around the edges, diff fr each year
96 has the spidery typeset zaskar on the top tube (see the xizang i my sig for the typeset) and it the first year of jut "GT" on the down tube
98-99 has similar zaskar to 94-5 but no all terra on down tube
all the 94,95,97-99 decals are similar, but they are all different for each year, colours, details. if you download all the catalogues ad compare (except you cat se well th 96 and 94? tiny catalogues) you get to compare.