pretty sure the 620 Monster has a 5.9M, my 695 has a 5AM
other than that I can't remember off the top of my head which ones are which

 

This would be the start of a great entry for the Hall of Wisdom.

 

ECU Models

Weber-Marelli IAW P7 ECU
851, 907 and early 888's up to serial number 000508.

Weber-Marelli IAW P8 ECU
Later 888's from serial number 000509, 916 Strada, 916SP, 916SPS, 996SPS

Weber-Marelli IAW 1.5M ECU
900ss, 750ss, Monster 900ie

Weber-Marelli IAW 1.6M ECU
One injector/cylinder: 748, 916 Biposto, 916 Senna, ST2

Weber-Marelli IAW 1.6M B1 ECU
Two injectors/cylinder: 996 Biposto, 996S

Weber-Marelli IAW 5.9M ECU
2001 Monster S4, ST4S, 996R
2002 Monster S4, ST4S, Monster 620, Monster 900, 998, 998S, 998R
2003 Monster S4, S4R, ST4S, Monster 620, Monster 800, Monster 1000DS, 620S, 800SS, 1000DS, 749, 999, 998, 998S, 998R

 

are we adding pictures too?

 

You can eventually double-check with this pdf list (see pages 2-4) from technoresearch. Blatantly copy&pasting (from the reference above ) :

DUCATI
*NOTE!* Euro2, Euro3 & performance ECU variants of stated ECU designations are all included in VDST functionality. Certain selected features may not be available for some of these variants due to changes made by the manufacturers, however the main functionality is not impacted.
2009 & EARLIER MODELS
1000 SS Twin Spark Magneti Marelli IAW 59M
620 SS Magneti Marelli IAW 59M
748 Biposto Magneti Marelli IAW 16M
748 R Magneti Marelli IAW 16M
748 RS Magneti Marelli IAW 16M
748 S Magneti Marelli IAW 16M
748 SP Magneti Marelli IAW 16M
748 SPS Magneti Marelli IAW 16M
749 Magneti Marelli IAW 59M
749 Dark Magneti Marelli IAW 59M
749 S Magneti Marelli IAW 59M
749 R Magneti Marelli IAW 59M
750 S Magneti Marelli IAW 15M
750 SS Magneti Marelli IAW 15M
800 SS Magneti Marelli IAW 59M
888 Magneti Marellli IAW P8
888 Racing Magneti Marellli IAW P8
900 S Magneti Marelli IAW 15M
900 SS Magneti Marelli IAW 15M
916 Biposto Magneti Marelli IAW 16M
916 Monoposto Magneti Marelli IAW 16M
916 Racing Magneti Marelli IAW P8
916 Senna Magneti Marelli IAW 16M
916 SP Magneti Marelli IAW P8
916 SPS Magneti Marelli IAW P8
996 Magneti Marelli IAW 16M
996 R Magneti Marelli IAW 59M
996 S Magneti Marelli IAW 16M
996 SPS Magneti Marelli IAW P8
998 Magneti Marelli IAW 59M
998 Final Edition Magneti Marelli IAW 59M
998 Matrix Magneti Marelli IAW 59M
998 R Magneti Marelli IAW 59M
998 S Magneti Marelli IAW 59M
999 Magneti Marelli IAW 59M
999 R Magneti Marelli IAW 59M
999 R '05 Magneti Marelli IAW 5AM
999 R XEROX '06 Magneti Marelli IAW 5AM
999 S Magneti Marelli IAW 59M
GT 1000 Magneti Marelli IAW 59M
GT 1000 Magneti Marelli IAW 5AM
MHE Magneti Marelli IAW 15M
Monster 1000 S Magneti Marelli IAW 59M
Monster 400 Dark SD Magneti Marelli IAW 59M
Monster 620 Magneti Marelli IAW 59M
Monster 620 Capirex Magneti Marelli IAW 59M
Monster 620 Dark Magneti Marelli IAW 59M
Monster 620 Dark SD Magneti Marelli IAW 59M
Monster 620 Matrix Magneti Marelli IAW 59M
Monster 695 Magneti Marelli IAW 59M
Monster 695 Magneti Marelli IAW 5AM
Monster 750 Magneti Marelli IAW 59M
Monster 800 Magneti Marelli IAW 59M
Monster 900 Magneti Marelli IAW 15M
Monster 900 Magneti Marelli IAW 59M
Monster S2R Magneti Marelli IAW 59M
Monster S2R Magneti Marelli IAW 5AM
Monster S2R 800 Magneti Marelli IAW 5AM
Monster S2R 1000 Magneti Marelli IAW 5AM
Monster S4R Magneti Marelli IAW 59M
Monster S4R S Testastretta Magneti Marelli IAW 59M
Monster S4R Testastretta Magneti Marelli IAW 5AM
Monster S4R S Testastretta Magneti Marelli IAW 5AM
Multistrada 1000 DS Magneti Marelli IAW 59M
Multistrada 1100 Magneti Marelli IAW 5AM
Multistrada 1000 S DS Magneti Marelli IAW 59M
Multistrada 1100 S Magneti Marelli IAW 5AM
Multistrada 620 Magneti Marelli IAW 59M
Multistrada 620 Dark Magneti Marelli IAW 59M
Paul Smart 1000 LE Magneti Marelli IAW 59M
Sport 1000 Magneti Marelli IAW 59M
ST2 Magneti Marelli IAW 16M
ST4 Magneti Marelli IAW 16M
ST4 S Magneti Marelli IAW 59M
Supermono Magneti Marelli IAW P8
Supermono Sport Magneti Marelli IAW 15M
Desmosedici RR Magneti Marelli IAW 5SM
Hypermotard 1100 Magneti Marelli IAW 5AM
Hypermotard 1100 S Magneti Marelli IAW 5AM
Superbike 848 Magneti Marelli IAW 5AM
Superbike 1098 Magneti Marelli IAW 5AM
Superbike 1098 S Magneti Marelli IAW 5AM
Superbike 1098 S Tricolore Magneti Marelli IAW 5AM
Superbike 1098 R Magneti Marelli IAW 5AM
Superbike 1098 R Bayliss LE Magneti Marelli IAW 5AM
Sport 1000 monoposto Magneti Marelli IAW 5AM
Sport 1000 biposto Magneti Marelli IAW 5AM
Sport 1000 S Magneti Marelli IAW 5AM
Sport 1000 Touring Magneti Marelli IAW 5AM
Streetfighter Magneti Marelli IAW 5AM
Streetfighter S Magneti Marelli IAW 5AM
ST3 Magneti Marelli IAW 5AM
ST3 S ABS Magneti Marelli IAW 5AM