727 Conveter help

OK, I have a 1966 727 which has been rebuilt but needes a new converter. I have a 1972 413 which was pulled from a motorhome that had a 727. I kept torque converter from the 413/727 however I am not sure if I can use the torque converter on the 1966 transmission? The 413 has the flex plate. I was told I needed a 090 converter for the 1966 transmission. How do you tell which converter is which. Attached are the photos of the 1972 converter and the 1966 transmission.

Can I pair the these two together without any issues. Any othere thoughts?

Attached Images
File Type: jpg conv.jpg (67.8 KB)
File Type: jpg Trans.jpg (62.6 KB)
Author: Cazbah362