The 'small wing' F28s (-1000 and -2000) didn't have polished leading edges - they were painted the same as the rest of the wing and lower fuselage.
As modelled here by PH-MAT/VH-FKF, which was #7 off the line: https://www.aussieairliners.org/f-28/vh-fkf/vhfkf.html
I believe it became the norm at the factory to polish the leading edges on the 'big wing' (-3000 and -4000) F28s, but some operators didn't bother with the increased maintenance and painted them or let them go matt.
The black ice detection strips on the leading edges became common (possibly mandated in some countries?) after the Dryden Air Ontario crash (plus several other incidents through the F28's life caused by undetected/ignored wing icing).
Not all the livery makers get this right - most of the -1000 liveries still have the polished leading edges with the ice strips. Sometimes they change the albedo texture but not the base texture (leading to a very matt-looking grey) and (more often, in my experience) they correctly copy the real-life paint colour but don't change the albedo file, so you get 'wet look' shiny leading edges.
For my own virtual F28 fleet I've got a stock of texture and albedo files that I copy/paste to get the right look. I love the F28 for its 1960s/70s retro character, so the polished leading edges on a F28-1000 just don't sit right!
