Is it possible to have multiple Job-Specific Application Acknowledgement message templates

Summary:

We have two external career sites each with their own job submission application flow, and we would like to use separate 'Job-Specific Application Acknowledgement' message templates, when the "Sending a Job Submission Acknowledgement Letter" action is triggered.

I can add Context to the Message Template based on Internal/External Candidates, but cannot see how to make it application flow specific. Both career sites are external candidates only.

Please advise if this is possible

Thanks

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