The only differences I'm aware of are G4 CPU vs Intel CPU and a few more programs installed on the G4 (not haxies though).
I've managed to dtruss Toast on open. Output is a little long to post here! The main errors appear to be unable to open toast.plist file, although this isn't surprising as its trying to open it at odd locations -->
525/0x358fd40: 4 stat64("/Library/Managed Preferences/com.roxio.Toast.plist\0", 0xBFFFD7C8, 0xB) = -1 Err#2
525/0x358fd40: 13 stat64("/var/root/Library/Preferences/ByHost/com.roxio.Toast.000a27ae4052.plist\0", 0xBFFFD7C8, 0xB) = -1 Err#2
Let me know if you wish me to email you the output or perform anything else.