The EPG screen is presented in the sequence that the channels are stored in the flash memory of the PVR.
You could try using the 'ChannelListSaver' TAP.
Save the channel list from your old PVR and then load it into your new PVR.
Double-check timers once the operation is complete.
If your old PVR is unavailable, the TAP creates a text file. Simply edit that file and then reload. Be careful of the EOL sequences. I also believe that there is some sort of checksum in the text file too.