A raw meal (with bone) should be digested within about 8 hours - versus about 11-13 hours for kibble. Thus, you should be fine feeding kibble for dinner if raw has been breakfast.
That's for being absolutely
safe. In reality, the food is likely to have left the stomach quite a bit sooner than 8 hours later
I would personally be quite happy to feed a kibble meal within 4-5 hours of a raw meal. The other way around (kibble first) I would leave somewhat more time between.