If the originals are air core and replaced with good quality air core with the same inductance and same dc resistance as the originals, I don’t think it matters too much.
But if you replace an iron core with an air core of the same inductance and dc resistance, then you "may" hear a difference, as an iron core will saturate earlier than an air core on big transients.
They sometimes use iron core chokes (coils) as a cost cutting (less copper needed) and for smaller physical size.
Cheers George