Migrating NATURAL from PA-RISC (64bit) to itanium (64 bit)

In this moment we have an HP-UX Server (PA-RISC 64 bit) and we are planing to buy a new server, with itanium 64 bit processor. Which are the implications of this migration on NATURAL programs? After relinking NATURAL on the new server, will our programs (in NATURAL) work the same way without modifying the code?