I think that both are significant because they represent the different approaches to the convergent desire to consolidate power. Napoleon recognizes that the absence of Jones leaves a vacuum of power that the Pigs are eager to fill. However, Napoleon sees past this and understands clearly that at some point, someone will have to assume full control of the power that is waiting to be plucked down like ripe fruit from the trees. In this, he sees that Snowball's attempts to win over the animals as "comrades" is a potential threat to his power. His disagreements with Snowball are one element of this threat. In response to this, Napoleon seizes the pups and raises them as his own private security guard, ensuring that power and authority go together. Napoleon lacks the eloquence and revolutionary fervor of Snowball, but he holds the ambition needed to seize power on his own and it is in this where the connection between his disagreements with Snowball and the need to seize the puppies lies. He understands that the needs of one might necessitate the other.