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Ultimately, because all extensive features are given by curves and those curves are approximated by line segments (when projected) or geodesic segments (when not projected), any errors are due to the fact that a line segment joining two projected points likely deviates (at least a little) from the projection of a geodesic between those two points. The ...
If you can access an IBM DB2 + Spatial Extensions installation, then you'll perhaps be able to integrate your data and then convert it to shapefiles : http://publib.boulder.ibm.com/infocenter/db2luw/v8/index.jsp?topic=/com.ibm.db2.udb.doc/opt/csbp4178.htm
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