Does anyone know if the lower unit from a 1968 Johnson 9.5 (model number MQ-MQL-14) is interchangeable with the lower unit from a '73 Evinrude 9.5 (model 9322B).
Both of those list the same gear case so I would say that they are most likely identical. I've got a 1969 lower on a 1973. Both were Evinrude 9.5s.
I don't think they changed very much on those through the years.