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ADS1294: Unused inputs

Part Number: ADS1294
Other Parts Discussed in Thread: ADS1298

The ADS129x datasheet says all unused inputs should be tied high.  Since the one datasheet encompasses different devices with different numbers of inputs, the statement is a bit nebulous.

Are inputs defined for the ADS1298 but not for the ADS1294 (like inputs 5-8) considered unused inputs or not present at all.

In other words, if I am using an ADS1294, should I tie inputs 5-8 high or leave them floating?

Thanks!