No one seems to be commenting so here goes. If you do a search for iron daisho tsuba you will see two things going on. Sometimes you will find a true daisho pair; tsuba made by the same hand and intended to be together. If this is the case then you would expect to see the same quality of plate, the same surface treatment, the same technique, the same shaped seppa dai and hitsu, thematically close though often with slightly different aspects in design.
The second thing you will find in your search is daisho sets made up of broadly similar tsuba. Sometimes this might be one of the more common designs by for example the Kinai or Bushu groups who tended to repeat certain designs rather often. (Kinai dragons or aoi leaves for example) I am afraid that yours slips into the second category in my opinion. The plates are different, the shape of the kogai hitsu is different, the technique is different, the quality of design and carving is different. They do both happen to have flowering trees. Of the two I like the larger more though I want to know what has happened to the blossom below the seppa dai.
Have a look at these, http://www.nihontocr...aisho_Tsuba.htm This is NOT a case of two common designs married as the write up points out.
I am sorry if this feels like rain on your parade. I hope it helps your studies in some way.
All the best