No, you will be provided with a dedicated free interaction counts for a example if you are on a "Large" plan it offers 25,000 free interactions in a month so you will get 25,000 free interaction for the phone automation and WhatsApp Shared Number each i.e total 50,000 free interaction but both can't be clubbed together.
Please note in "Unlimited" plan free whatsapp shared number interaction is limited to 50,000 in a month