The splines appear to be far more robust on the upper picture………Is that because of the wear that took place…….. it doesn’t look like that would be a positive engagement compared to the otherView attachment 126417
This is a boninfante from Ram. 10 rivet instead of 8 and the splines are a good .150 wider than the Ace below.
View attachment 126418
The rivets are loose on the Ace after 25 passes. This is the style of hub I sheared the splines off like yours.