Difference Delonghi PrimaDonna devices - HELP

Dear coffee community,

my fully automatic machine finally gave up the ghost after 10 years. Now it shall become a Delonghi PrimaDonna, BUT here it stops. The comparison on https://www.delonghi.com/de-de/produkte/kaffee/kaffeemaschinen/kaffeevollautomaten does not work for me, no idea why.

Can anyone explain to me, in particular, what the difference between the machines is: ECAM 656.85.MSECAM 656.75.MSECAM 656.55.MSECAM 556.75.MSECAM 556.55.MSECAM 556.55.WECAM 556.55.SB in terms
of the B letters
? MS, W and SB?
In principle, the machine is used exclusively for black coffee, including sometimes an espresso, or even a double :-) I have never used hot water, milk or anything else in the last ten years and I won
't use it again
!

PS difference in the colors is clear, thank you!