Excellent comparison, Andre. The sound of the Scala Scaletta strikes me as a more open, that of the Yamaha a a bit more muted, though both sound more muted than, say, a Suzuki M-32C. I am impressed with the sound of the Scala, which works extremely well for the Pascoal piece. I just found lead sheets for some of Pascoal’s tunes:
https://noteheads.wordpress.com/tag/hermeto-pascoal/