If you are doing a bare metal respray with all K&H products used, all specifications as listed by K&H and products applied the way they specify, then it should all come good with skill and patience.
However if you are combining products and mixing different brands, I would not recommend this in any case, but in this case certainly cannot give guarantee that it will all be good.
I find some products work better in touchup and repair situations, and Dulux Dulon is a good example. Standox has a more aggressive thinner in it and it will have more chance of creating reactions with underlying substrates.
So the answer is Yes K&H primer and topcoats are alright in the right situation.
I have no hesitation in using the K&H body filler, underbody deadener or seam sealer anytime.
