Mr Rick,
It’s curious to me that the oil names present a significant puzzle, as it appears different product names (and compositions?) are offered in different regions of the world. For instance, the oil you raised the question about is in Castrol’s Power 1 4T series, but when I search the Castrol site, they list only one such “Power 1 4T” oil in 20W-50 weight. Yet when you search the whole i-net there are a variety of Power 1 4T oils in 20W-50 weight as well as “Power RS 4T 20W-50” offerings (e.g., Amazon, Google, etc), some are labeled for motorcycle, some for V-Twins, and some with no labeling at all regarding their applicability. Is the "Power RS" the same as the other "Power Release" oils, just abbreviated for a different market/region? The labeling presents a conundrum in it’s own right.
In the charts Jim published (post #923 on page 47), on the “may cause excessive wear” plot, I see a Castrol Power 1 4T V-Twin 20W-50 oil listed, but the performance is significantly lower than the specific oil you inquired about, so all "Power 1 4T 20W-50" Castrol oils are certainly not the same. Hope you can somehow identify the oil you inquired about. Perhaps Mr NKN can assist.