The numbers have different values because the shapefiles have data in
different coordinate systems. It looks like the data for that
shapefile is actually for the 3435 SRID:
http://spatialreference.org/ref/epsg/3435/
(3084 a NAD83 projection for all of Texas!).
Unfortunately, most shapefiles don't explicitly label their SRID in
their projection information. However, by reading the spatial
reference text ("Layer SRS WKT"), and using spatialreference.org, one
can be quite successful in figuring out what SRID it corresponds to.
Your fortunate that this file came with projection information, as it
is not included with some shapefile datasets -- making it
significantly more difficult to determine the coordinate system.
Regards,
-Justin
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