Hustler Raptor Engine

I am looking to buy a zero radius lawnmower. My wife has come across a used Hustler Raptor 48" with 60 hours on it. It has a 19 hp S31Q677 Briggs and Stratton Engine. I am curious about the engine. I do not see anything to indicate that Hustler ever put Briggs and Stratton engines on their mowers and the 48" all seem to have 22-23 HP motors. Should I be concerned about the engine and mower?

Hustler Raptor Engine