Well, although I worked on both of them, they really had nothing to do with each other.

To oversimplify, there was the “Senior” Newton project that was the outgrowth of what was going on when I joined in 1988 and would have been Dylan-based, and the “Junior” Newton project that I switched to in 1992 (?) to make a smaller, less capable, but faster-shipping product. Junior hardware was so much smaller that we had to do essentially a whole new architecture, which ended up having NewtonScript as the app language.

Had Senior shopped there would have been a compatibility later (presumably including a Dylan version of NewtonScript), but we didn’t get that far before Senior was eventually discontinued and everyone focused on Junior.