I'm looking for some advice from experienced raw feeders please

I have a flatcoat who is now 20 months and has been on a raw diet for almost 6 months - he is doing great on it and I'm reasonably confident that I'm giving him a balanced diet. I now have flatcoat puppy who is 14 weeks and so far has been on James Wellbeloved complete. I would like to change him over to raw but want to make sure that I will be giving him what he needs to ensure he grows well. For my older dog I work roughly on giving 80% meat, 10% bone and 10% organ meat and use a variety of meat and fish, with egg and yoghurt thrown in once a week too. I know that I would need to feed the puppy 2-3% of his expected adult weight a day, but do I need to adjust any of the proportions or can I just give him exactly what his older 'brother' has?