The essential difference between a general and a tailored programme is the starting point: the first starts from the curriculum, the second from an analysis of your team's actual needs.
Customisation does not mean changing the logo on the slides. It means replacing the examples and cases with ones drawn from your data and your procedures, so the employee trains on what they will actually do next Sunday.
The second benefit is a shared language inside the team: when a whole department trains on the same methodology, conflicting interpretations of terms and procedures disappear.
The third is purely practical: timing and location follow your operations, and the programme can be split into short sessions that do not interrupt production.
Finally, a tailored programme is easier to measure, because its objectives were written in the language of your own performance indicators from the start.