Anything manufactured in the past 25 years or so will have a 2deg taper. ISO and JIS differ only in the length of the taper and overlap over most of the length of the taper. Nothing bad will happen if you put an ISO arm on a JIS spindle, or vice-versa -- only the chainline will suffer.

N.B. back in the 70s and early 80s there were some (mostly low-end) spindles with 2.5deg and 3deg tapers -- these could cause damage if the wrong taper arm was installed. But these have been deprecated for many, many years now and are seldom seen in the wild any more.