Vacuum reservoir for power brakes

1973 Mild 360. It is an A/C that has power brakes and a dual connector vacuum reservoir for the heater control that is connected to the v-nipple on the intake manifold. The other connector goes to the power brake booster. I am looking to add a larger reservoir for the power brakes since I am getting about 14-15” of vacuum.

Can I add this reservoir to the vacuum connector on the intake connector and then to the power brake booster leaving original existing canister for the heater control?

Thanks