Here’s a setup that renders cryptomatte to one Render Product, and the lighting AOVs to another Render Product.

This uses the new input port on the Arnold Render Settings LOP.

This results in the following scene graph:

which renders two EXRs

00:00:09  3152MB         | [driver_exr] writing file `C:/Users/blairs/Support/houdini/beauty.0001.exr'
00:00:09  3152MB         | [driver_exr] writing file `C:/Users/blairs/Support/houdini/crypto.exr'