Rated Comments for a Single Item

Can a knight assimilate with a queen?
In reading the rules it appears they my not, is that correct?

(1) Can a piece capture an enemy with which it cannot combine? If not
ignore the other questions.
(2) If a piece captures an enemy with which it cannot combine, is the
capture exactly like FIDE Chess, and if not, what happens?
(3) Are there any circumstances where it is advantageous to capture with
the whole of a compound piece rather than with just a component that can
combine with the captured piece?