Nodes with branching (e.g., Route, Distribute) do not allow for the use of presets with the same name across Workflows. The rationale is that if one changes the number of branches (leading to orphaned branches) in one WF for a preset, it could/would break other WFs using the same preset. Therefore branching node presets are a starter for a new node, which must have a new/unused name.
If I open an existing Route node and click "Edit preset name", then change name and save the node, the following happens: