These days, yes. Older devices were usually only made for one frequency or the other. Clocks, for example, would not keep time correctly if they were using the cycles as a way to count time and were used in the opposite area for which they were designed.
We have different operating frequencies here in Japan depending upon which part you’re in. Some is 50hz some is 60hz.
Are devices generally interoperable?
These days, yes. Older devices were usually only made for one frequency or the other. Clocks, for example, would not keep time correctly if they were using the cycles as a way to count time and were used in the opposite area for which they were designed.