I'm not sure what you mean by "Instance". I will take a guess that you mean the Teradata Database version.
Our Supported Platforms matrix, published here on Developer Exchange, lists the compatibility between Teradata JDBC Driver versions and Teradata Database versions:
http://developer.teradata.com/doc/connectivity/jdbc/reference/current/platformMatrix.html
Generally speaking, our policy is for each version of the Teradata JDBC Driver to support the corresponding Teradata Database (termed "current") and the previous four Teradata Database releases (termed "back 4") and the upcoming four Teradata Database releases (termed "forward 4").
back 4 + current + forward 4
So Yes, we do provide forwards compatibility between old Teradata JDBC Driver releases and newer Teradata Database releases.
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