Updated plastic... not sure what this means. Most trim was the same from 91-95. There were a couple of little differences but not much. Front ends were the same throughout the model years. Ditto rears.

The 93 had single airbag. 94-95 had duals. 95 had glass roofs, I believe.

That is MOSTLY the extent of it. There was some minor variety between them. They ALL had ABS brakes and most of the same features. Most 93s seem to be very well equipped, while 94-95 saw many base models, probably to stay competitive. You can still find the 94-95 models well equipped, though.

Turbos were not always marked in 93-95. Sometimes though.

Fundamentally they were VERY similar. A few minor engine differences. The whole product line (940GL/940T/940) was very solid.
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1992 940 wagon, low miles
as well as others.