Oh, this is a fun topic. Yes, the ammeter is the same; the difference is that the Goose was +/-50 amp and the Pantera was +/-75 amp. The fuel gauge is also fun, because the Mangusta was different only in that there was no fuel reserve light. And here is where things get fun, and where you could rest easy and just change the bezels from Pantera gauges---because the Mangusta wiring diagram shows a fuel reserve light...And as well, at least some Panteras were shipped without one.
Otherwise, tach and speedo are the same--of course different bezels, and from mid 72 Pantera were 1600 revolutions per mile (instead of the 1200 rpM Mangustas are supposed to be). Mangusta temp gauge is 230', the Goose has the mechanical Veglia clock and also the 280' Oil Temp gauge...But somehow, any of these pieces may have found their way to some Panteras.
The "half V" bezels are available in chrome advertised for Fiat 124, but Veglia gauges are super easy to find for donor parts and (as long as the gauge is a steel case, the plastic cased gauges provided in the 70's used aluminum bezels that will never survive a transplant) there are plenty of donor parts for the 52mm gauges...Bezels for the 125mm speedo and glass are unavailable new but complete Pantera pieces are still affordable...Lee