Not that I'm aware of... the game images need to be patched to run via TEST/Debug, but as far as I know there isn't any extra data. CJPC would probably be able to elaborate though...
As for comparing a PC drive-dumped image to a PS3 Linux-dumped image the extracted files appear the same but the entire image/size I will have to check and report back on.
Edit: My Untold Legends: Dark Kingdom
PS3 image dump sizes:
PS3 Linux: 8.27 GB (8,880,652,288 bytes)
PC Drive: 8.27 GB (8,880,652,288 bytes)
So it appears they are identical indeed.