The terms electromechanics and mechatronics seem similar, but there are some subtle differences. It also appears that if and when the newer term, mechatronics, is fully defined, their differences may very well be much more significant than they are right now.
The older term, electromechanics, dates back to at least 1885, when engineering students at some colleges could take courses in it. Basically it’s a combination of electrical and mechanical engineering. Note that classical electrical engineering does not involve any kind of ICs or semiconductors. Those are in the realm of electronic engineering. (That’s why IEEE makes a point of including both electrical and electronic engineers in its name.)