I don't know, just my impression as a LAME was PIC of a turbine required a CPL.
I never had a reason to check that.
But was also told the AN2 was the largest aircraft that can be flown on a PPL, But I think the C208 has a greater MTOW, but still below 5,700KG. But still requiring a CPL due turbine.
Could be way wrong, just was what I have assumed over very many years.