[SI-LIST] Differential Signals with changed ground references

I am currently trying to determine the performance of an interface 
where the PCB ground planes and the device grounds are not tied 
together (except on the very outside of the PCB).

I recognize this is a design flaw (I didn't design the PCB), and I also 
recognize that this causes floating signals for all single-ended 
signals.

However, my intuition tells me that the differential signals would 
perform okay (ignoring any failures due to PDS - strictly from a signal 
integrity perspective).

Am I correct in this assumption?  Or would it be based on the device 
design and how the device reads the differential inputs/outputs?

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