I believe the 20/96 (not 24/96) was a separate upgrade to the Version A.
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Elberoth2 is correct. The A version changed some of the analogue circuitry and possibly other things, but did not change the 16 bit 48 kHz max capability. There was a separate upgrade to allow it to convert 24/96 content (at 20 bits as Elberoth2 pointed out).
I have a Gen Va with the 24/96 upgrade and it sounds fantastic with 24/88.2 and 24/96 content. I use a Slim Devices (now Logitech) Transporter as my source for 24/88.2 and 24/96 material, and include a Genesis Digital Lens for 44k and 48k material.