It's like if you have Rock Tomb and Stone Edge. Does Stone Edge as Max Rockfall do more damage because it has a higher Base Power.
Similar to Z-Moves, the type, damage category and base power of Max Moves that a Dynamax Pokémon knows depend on the moves it knew before Dynamaxing. The exception to this are status moves, which instead all become the Normal-type Max Guard.
So yes, the base move affects the power. For your example, a Max Rockfall with a base move of Rock Tomb will have a base power of 110 compared to 130 if the base move was Stone Edge. Source: https://m.bulbapedia.bulbagarden.net/wiki/Max_Rockfall_(move)