Hi Shauna-Rae,
FYI: Web AppBuilder embedded within Portal for ArcGIS is typically a release "behind" Web AppBuilder that is embedded within ArcGIS Online. This is due to their software release cycles.
Clarifying 3 questions about Web AppBuilder for ArcGIS | ArcGIS Blog
(please see question 1)
In the case of Portal for ArcGIS 10.5, it contains Web AppBuilder for ArcGIS v.2.2.
> Better yet, is there a table that shows which version of WAB is running on which version of Portal? If there isn't a table, could someone at Esri, please, make a table in the documentation showing these relationships?
FYI, the Portal 10.5 help doc does have info on Web AppBuilder, What's new in Portal for ArcGIS 10.5 and 10.5.1—Portal for ArcGIS | ArcGIS Enterprise (scroll down to the end of the topic)
Thank you for your feedback. We'll work on improving the doc.
Hope this helps,