Yes, but do you think any of these differences were due to the lighting conditions?
Could be. The underlying issue is that variations in lighting, background, and human perception can affect how any particular witness describes a particular color. Does this prove it was Oswald? No. Does it allow some room for doubt that Brennan was describing Oswald. A little bit. Is it a deal-killer proving that Brennan didn't see Oswald? No.
I take it your insistence on asking the same question spring from what might be called some kind of whizzing match with some other poster, but there's no point in keeping that up, is there.