Puppy's use so much energy just growing let alone all that chewing, Zoomies and generally just looking cute
I was so paranoid about my girls weight as a pup, the vets will help put you at ease with that, I kept all Bea's weight written down so that I could compare how she was doing month to month.
All pups are different and the packaging is just a guide as Mari said, they don't know your pup.
I would feed them separately so that your pup doesn't feel the need to guard his food or bolt it down like your other dog.
Sharon.