Yes, The same Telon Design Facility VSAM files can be used for a Telonmigration from Telon 4.x to Telon 5.1.
From CA Telon Application Generator
r2 on, CA Telon Application Generator
is upward-compatible but not downward-compatible. After a TDF database has been used for a new release (for example, 5.1), do not
do notaccess it with an older release (for example, 2.4) load library. This will cause unpredictable results.