When routing a high impedance charge accelerometer signal through a charge amplifier, the signal is first converted to a low impedance voltage signal, via the charge converter stage. This will cause a 180° pahse shift in the signal. If the charge amplifier is a dual stage amplifier, the second stage will cause another 180° pahse shift in the signal. If this is the case, you will not see a phase shift in the final output signal.
If you are running the high impedance signal through a single stage charge converter(line driver/ remote charge converter), you will see a 180° phase shift, as most RCC's are single stage converters.