Yes, the .AC7 format is universal for all Casios that support it. The older .CKF Rhythms are backwards compatible and will be automatically converted to .AC7 when loaded on to newer models.     The voice assignments are exactly the same for the shared tones between the X800/X700 and the X3000/X5000, so that's no surprise. All the AiX boards, including the CDP-S350, have the exact same voice assignments, even down to the Program Change and bank select values. You can verify this
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