The TimeSeriesDisplayConfig file should be amended. The section moduleInstanceIdMappings should contain the ModuleInstanceIdmappings for both models. This means that the section from one model should be merged with the section from the other model.
example for a merged TimeSeriesDisplayConfig file
The Explorer file should also be amended. Layers for both model boundaries should be added to the Explorer file (map section). In each original Explorer file the esriShapeLayer reference to the model boundary should be copied to the Explorer file to be used in the merged configuration.
