IMO it looks like a different chip but i dont care if it is or not I did however scan some close ups for anyone who wants to try and make a determination one way or the other...
Heres the 3 i have to compare. Someone else may have the grey $1 to scan but i do not. Two are obviously blank small keys and the other is the chip in question.(scroll down for the close ups)

Lucayan $1...

Beige

Grey