True, but different models (or I should say different individual units) behave differently - some machines won't run stably if, for example, you mix EDO and FPM DIMMs.
EDO are fine in a pinch or if you get them for free. But my advice, if one is going to buy RAM for these machines, or if one has a lot of compatible RAM already on-hand, is to stick with FPM.
Best,
Matt