Without actually seeing the chip its hard to tell - but that does seem to be the correct type of chip - at least according to the guide I found here. Be sure to match the part numbers (these are etched on the chip - I needed to look at it under my desklamp), and ensure proper orientation - the chip should have a small indent on the bottom left as per your photo, and this absolutely positively has to match.
I'd add overvolting it might have fried other components - any voltage regulators (these have 3 pins and are 'sinked' to large pads) and possibly the ram used for caching come to mind as very sensitive parts. This might possibly include the rom chip so there's no guarantee this will work.I'd inspect, both by eye and with the sniff test these components. As with any recovery scenario, all this could have been avoided by due care, and regular backups. Even if this did work, there's no guarantee of long term stability from the drive, so I wouldn't recommend using the drive for anything you feel is important.