I lived through the 1975 debacle but as I imagine and place myself (in my mind) in the shoes of a JW just before 1914 (like Benjamin in his letter to his deceased grandparents), I actually don't think that they are parallel.
Before 1914, the believers had far more numerous and concrete things to look forward to -- 24 of them. The 1975 folks were looking for an inferred event since WT never said anything definite. Of course WT admitted that their implications went too far.
Before 1914, as that table of quotations reveals, WT gave those folks definite events in their future. It would be interesting if we had statistics of the falling away of those years.
1914 WT was worse than 1975 WT.
Len Miller