The parts book says that the pedal boxes are the same. However, there are early and late versions. Which version is correct will depend on the chassis number.
Spiders up to chassis #1495.04255 have the early version; part #1365.66.711.
Spiders from 1495.04255 got #1365.66.741, the late version.
Series 1 Euro 1750 GTV
Series 2 USA 1750 GTV
Series 3 Spider Veloce