Hi Troy
The images are not further compressed - they are simply uploaded as is.- Images are not modified if they are under the size limit.
- Images are modified if they are over the size limit. In which case, the forum software will try to reduce the size of the image to meet the attachment size limits. Currently that is 200KB per attachment.
Regarding your images, they are identical to me.
The black background vs white background can make them look a bit different, but I took a screenshot of both images, and layered them in photoshop and blink compared them, and there's absolutely no difference.
I even changed the blend mode to 'difference' and I got a black screen - so the images are identical.