I couldn't give your part no's, but I noticed a big difference between the Cherry switches on my old HotRod (the more clicky type), and some I have more recently got with pushbuttons from Ultimarc (spongier type).
Personally while I don't mind the feel of either, the type on my HotRod seemed prone to failing, or just being crap (sometimes even though you could hear them click, the contact would not be made until pressing further). So far the ones from Ultimarc are fine, and I think now I prefer the feel to my other Honeywell microswitches (firm, clicky switches).
Edit: Incidently, I seem to recall Andy mentioning that the newer type Cherry switches are in fact more reliable, which may explain the problems I described with mine.