Is this general rule across the board including 289 and 302 engines?
Yes. It is the same sender.
With the way companies designate responsibility to some numb nuts lowest entry level engineer to spec it, I would caution everyone that even if Motorcraft for instance decided that there was enough of a market to remake them, I would not be shocked to find that they made them with the wrong ohm rating as well.
You must realize that these companies are still run by MBA's who will tell you that an item like this is only worthy of a minute or so of their time and assign it to someone with little or no experience in getting it right the first time or aware of the pitfalls of using someone else's data.
You are still better off with an original IF you can find one. It will save you alot of grief, wasted time and energy.