The major difference I can see with that Cherry 2000 keyboard is the square F Keys as opposed to rectangular.
BTW, I see you have some Archimedes stuff. Do you happen to have a spare lower case section for the A3000 in good nick? It was really annoying when I purchased my one and only A3000 off e-bay (2011 I think) and you know how the mice are quite rare and ultimately very expensive? Well mine came with a PC mouse with one of those short converter cables to convert the plug. The converter cable doesn't fit in the A3000 unless you cut away some of that plastic from the battery compartment / mouse socket section. Mine looks like heavy duty pliers were used.... oh how it bugs me. I want it replaced! If you have a spare let me know. Thanks.
The square keys are basically cus it uses the Cherry MX Black keys which is unique to this keyboard.
https://deskthority.net/wiki/Cherry_MX_BlackI have just two A3000s and no spare cases sadly. It is a problem with the mice but on my RiscStation I was able to use a PC roller mouse using the roller as the middle button. What I found is that I wasn't able to use later mice that run on the red light, but only mice that had an actual roller ball. I generally keep an open search on Ebay for all kinds of mice. Same goes for the Amstrads. Cost me a fortune in truth. Bit like getting C64 mouse for my GEOS the one that is like the Amiga mouse. Always worth checking.