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Optionally, if you would like to use the volumes fields you've generated from the KaBoom Box HDA, leave this option unchecked, and then in the shader applied in the other third-party software, check on 'Use Binding Field Only' in the Smoke, Scatter and/or Fire tabs and enter the string name of your fields in the Bindings tab. See section for (Eugene Riecansky ENTER LINK FOR SECTION - explaining loading VDB and applying preset shader in other software) for more comprehensive instructions on how to do this.

Utilizing the functions of the KaBoom Box HDA is the recommended workflow for shading if the user would like to take advantage of VEX/VDB processes that are native to Houdini SOPs networks. It can also be a more desirable workflow for look-developing using the viewport. Caching the shading calculation data into a VDB can also save render time for high resolution or data heavy volumes.

Eugene Riecansky Section here will a walkthrough from Houdini to Maya for example might be useful for users