All images from The Race
Looking purely at the upper half of the sidepod (all painted parts) including the inlet scoop, mirror supports: they are surely a reused/carried over specification
Side comparison shows that the rb19 has a proper t-tray like McLaren debuted with which is a bit unusual for the grid. Most have what RB18 had.
Side comparison also shows the overhanging uppermost front wing element which sits much beyond the endplate