I would say that is evidence that the neutral is not in play and you can use one CT with double checked. You can make the same observations with any other 240 circuit where you have two CTs. I would not bother with an output, just plot the two over a period of a day or more and observe if the two plots lie exactly over one another and see if the Wh integration shown in the statistics tab are the same.
You can see some other variations on using splitters in this post: