1990 was the last year of the 760 turbo. That model was dropped for 1991,
and the 940 was introduced in 1991 with the same front-end as the 760, but
a redesigned backend. It was offered only with a B230 (turbo was also
offered), i.e. the PRV V6 was dropped.
The 960 was first offered in 1992. The inline 6 engine is interference.
It was not turbo-charged. Turbo-charged variants of this engine are
offered in the S80 now.
Only on the outside. 940s are redblock, 960s aren't. 960s are more
luxurious on the inside.