A Chinese news outlet has recently broken the story that OPPO and OnePlus - two heretofore independent brands under the BBK Electronics umbrella - will "merge" their research and development efforts. This leak, which might mean the 2 OEMs start producing much more similar products soon, has been confirmed to some extent by OnePlus.
https://www.notebookcheck.net/OnePlus-and-OPPO-are-to-share-R-D-teams-in-the-future.516258.0.html