Where is the progress actually stored?
Look at the publisher’s current support documentation for that game and platform. Distinguish an account used for purchases from an account used for game progress if the game makes that distinction. Ask the child to show you the current save or profile so you can recognize it later. Do not assume that a general device backup includes every part of a game, or that signing into a store automatically restores all local progress.
What should happen before we change anything?
Follow the documented backup or transfer process and confirm any required account access. Keep recovery methods with the responsible adult. If the process warns that a save will be overwritten, pause and identify which copy you want to preserve. Avoid experimenting with deletion as a troubleshooting step when you do not know where the progress lives. An installation problem can be inconvenient; losing a child’s long-running project can be much harder to repair.
How do we verify the move?
Open the game on the new device and inspect a recognizable point: a level, inventory item, world, or saved creation. Confirm that the child can continue from the expected place. Only then consider removing the old installation under the publisher’s instructions. Keep expectations honest if the game does not support transfer between those platforms. Explain the limitation plainly and decide together whether the new setup still makes sense, rather than promising that every kind of progress can be carried over.