I would absolutely call the other guy and I would also let him know about the other interview. It's possible that guy A let guy B know that you had applied and thinks that you would be a better fit for guy B.
Before my MIL died, she ran multiple restaurants within a hotel in Vegas. Even though they were all part of one big Hotel, the individual areas did their own interviewing and hiring. All the applications went through one main HR, and were then distributed to the different areas where the skills matched up.
Who knows, guy B might actually have an even better place to work.
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