Is there any way to make it so that the same random number is selected every time you run the game?
You can use Random Streams for that
RandomStreams allow repeatable, random numbers to be generated and used inside of Blueprints and Level Blueprints, as well as AnimBlueprints for animations. This can be extremely useful when setting up effects, such as scattering objects or building procedural environments, where you want a random effect, but also a consistent distribution each time the graph is evaluated. Previously, using random values would result in a different distribution each time the graph was evaluated, meaning moving the Blueprint or performing any action which caused the graph to be re-evaluated resulting in a completely different effect. With RandomStreams, you can tweak the effect based on a seed value to get the desired result, and then perform any other modifications you want while maintaining the overall effect.