as long as you dont mix cooked (kibble... wet ) with the raw....
as the raw and the kibble digest at differant times so it is better to give about 2 hours
in between, so yes it will be fine to feed kibble for one meal and raw for the other
you can also give them eggs and the shell crushed up and fish (tinned) like pilchards
and veg as long as you blitz it, if you leave it as is, it will just go in and come out the same
if you blitz it they will be able to digest it
did he like his raw dinner last night