Asset discovery and identification currently operate as follows:
Each asset instance is managed by the Asset link that first discovers it. During a rescan, any changes identified by this initial Asset link are updated. However, results from other Asset links are not merged into the Asset information model. Since scan results from different Asset links are not merged, it is recommended to initially use the Asset link expected to provide the most comprehensive data.
I hope this helps in clarifying how different scans interact with each other and how to get the most out of asset discovery.