I saw this post yesterday and was hoping that someone that had actually tried this would have replied already, but I’ll though in my best guess:
Yes it should work because the sonar recording is the raw sonar data. The unit you play it back on would have to have the same sonar capability otherwise you would not have the same Views to see the sonar data on. Your 1198 and 998 should be able to display each others sonar recordings fine but a 2D sonar only unit may be able to show the 200/83kHz sonar data from a sonar recording taken from your 1198 but not the Si sonar data as it does not have the Views/programming to do so.
Or at least that is the way I think it will work…