If you check the specifications for the Pa800 and the Pa2X Pro they both say:
"Voice Processor Technology by TC Helicon: Three-part Harmonizer, Reverb, Delay, Compressor, EQ"
The specifications for the Pa1X Pro say:
"Voice Processor Technology by TC Helicon: Four-part Harmonizer, Reverb, Delay, Compressor, EQ – Pitch Correction and Voice Modeling available as option"
Therefore I would guess that the Pa2X Pro and the Pa800 have exactly the same voice processor - also because the two boards are so similar in every other way.
Kind regards,
Tommy
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Yamaha PSR-S770, Korg Krome 61