The model 130 will interchange with modern boards as well!
(Edited post for clarity and continuity due to Sordnas follow up post)Right now, I don't specifically remember about the 120 I may have the info in the Kinesis wiki article, but I don't think the 120 is interchangable. Sordna has a keyboard, it's the Kinesis Try and Forward keyboard, it is different internally, it's a #110. So a #110 is not interchangeable with the 'modern' keyboards.
The only other difference between physically connecting the keyboards is that some have the pcb that plugs in the main board verses using a ribbon connector, verses a reversed connection. But this discussion is academic until you have several boards and want to get creative
At that point I'll come out of my coma and jump on in!
This may help...for the most part (there are a few exceptions floating around)-
PCB connection:
130, Essential, Classic, ProfessionalRibbon connector up to SN#50,000:
Advantage, Advantage ProReversed ribbon connector after SN#50,000: (main board connection is reversed, the key wells are the same)
Advantage, Advantage ProIn general, if you are going to mod/use several keyboards, I would not use 100, 110, 120 ONLY BECAUSE these 3 models are in short supply and will be difficult to get when you need one quickly when purchasing on ebay or equal.
The wiki is effectively almost worthless at this point, it needs to be rebuilt. sigh