Any oil change will change the results, although if in brand you stayed with the same formulation (that means knowing what is going on behind the scenes with the batches), and IFF you could garantee the same usage, driving, weather, fuel, dust, etc., you might see a different wear trend with a different viscosity.
As a general rule, I see wear go up in an engine that should run 15W-40 when the viscosity drops, and a trend upwards when it goes too high. Although the upward is more difficult to pinpoint as the causes of thickening (soot, dirt, oxidation) can be causing the wear, rather than just the viscosity.