Yes, you're correct, the catalogue is a little ambiguous, showing individual pictures for both the MX and the ME, but then referring in the text to "... three types: MX/ME …" etc.!
The extra factor to consider is that there were also three different front covers for these cases … not easy!
I have a similar (but slightly different/later) catalogue which shows pictures for seven options of cases and front covers and again, it is ambiguous, separate images being shown for the ME and the MX but the text referring to "MX, ME, MV, MV-1 and ME Super" etc. as though it was all one item, though, as with your page, the "Short Soft Case" is referred to as different for each model!