Yeah night shift…Booo..
As far as I know, all the Shimano STI units that have the cables coming out of the side are the same size, from Tiagra thruogh 105, Ultegra and D-A.
The ‘new shape’, concealed cable STI units are also all the same size, including the Di2 and Ultegra electronic STI.
I’ve not used the D-A 7800, but they are the same shape and action as the Ultegra versions I pictured.
As I said, I much prefer the new concealed cables version; a lot more thought seems to have gone into the ergonomics, they fit my hands better and are slightly different in the angle that they attach to the bars, allowing a smoother flat-bit-of-the-drops to lever transition.