The PCM 70 Ver 2 & Ver 3 have completely different Preset Registers. Many upgraded to Ver 3 to gain the Inverse Room algorithm but lost the coveted Ver 2 Preset Registers in the process.

These are the  SysEx register dumps from both Ver 2 & 3 for all to enjoy.

Lexicon-PCM-70-Ver-2.syx (Thank you Karl Lund)

Lexicon-PCM-70-Ver-3-without-row-6-for-ver-2-Reg.syx

Use a SysEx utilty to send them to the PCM 70 Registers.