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Export FBX from Mudbox

Before you start sculpting, export your Fbx from Mudbox.

Export an OpenEXR from Mudbox

Export a PTex from Mudbox

Maya 23 > Mudbox Vector Displacement > mudbox_ptex_extractTextureMaps.png

Import FBX and Add Subdiv Scheme

Import the FBX you just exported from Mudbox. For its shape node, add Attributes|RenderMan|Subdiv Scheme:

Assign Displacement Shader (UV Texture)

Create a PxrTexture node. Set the Filename to your exported Muxbox EXR map. Keep all parameters at their defaults.
Create PxrDispTransform node. Set Displacement Type to Mudbox Vector and Vector Space to Tangent.

Create a PxrDisplace node (this is the displacement shader that actually displaces your surface).
Connect PxrTexture's output Result RGB to PxrDispTransform's Disp Vector.
Connect PxrDispTransform's Result XYZ to PxrDisplace's Disp Vector. Your graph should look like this:

Assign Displacement Shader (PTex)

Create a PxrPtexture node. Set the Filename to your exported Muxbox ptx map. Keep all parameters at their defaults.
Create PxrDispTransform node. Set Displacement Type to Mudbox Vector and Vector Space to World.

Maya 23 > Mudbox Vector Displacement > mudbox_ptex_PxrDispTransform.png

Create a PxrDisplace node (this is the displacement shader that actually displaces your surface).
Connect PxrTexture's output Result RGB to PxrDispTransform's Disp Vector.
Connect PxrDispTransform's Result XYZ to PxrDisplace's Disp Vector. Your graph should look like this:

Maya 23 > Mudbox Vector Displacement > mudbox_ptex_vectorDispGraph.png

Render

Add PxrSurface, assign it to the model and add some lights, set the displacement bound appropriately, and render!