No, there isn’t a way to revert the field ID values. The only place you will find the field name is in the wrapper div data-name="field_name_here".
In addition to the change in IDs and classes, even changing them would likely not help with the JS. If the JS is dependent on ACFs JS then it probably will not work anyway. The JS in ACF5 is completely different than ACF4 and any custom JS that interacts with it would need to be completely rebuilt.
