Yes: There are at least two types of membrane. The Mitsumi is for the AmigaTech (post-Commodore) keyboard and A2000/A500 keyboard... possibly A1200. The A4000 had a different membrane although I can't recall the manufacturer. I'm sure the Mitsumi won't fit an A600 as it had the smaller keyboard without the numeric keypad. I had just replaced a newer AT keyboard's Mitsumi membrane last winter.
