It should be, yes. Rosewood is fairly stable, and as long as you oil it every few months like you would a rosewood fretboard it should be fine, since its quite an oily in the first place it won't be as susceptible to shrinking as it dries like a maple neck would be as it dries over time (especially flatsawn maple, quartersawn maple doesn't generally have as big an issue with fret spout as flatsawn does)
for ebony
i've read sometimes that it's not the best wood regards fret's sprout
but ive owned somes Taylor acoustic guitar which have all ebony fretboard and never notice this case
the only case that's happen to me was on a rosewood fretboard ...
I have never had it on a RW fret board and I have quite a few of them, though I do not have a solid RW neck on a guitar. I have had it on 3 guitars and I believe that it is most common to happen on unfinished necks in certain weather climates. I am not blowing smoke but I never had a problem with any of my EB guitars, I had it on two Wolfgangs years ago that I bought on ebay that came from Nevada and Arizona I believe, places that have dry climates. I live in NY and my friend Mike who does all my guitars just told me to wait awhile and see if it goes away. Well sure as sh!t in a month it was good as new so down the road when I got the second one which had the same problem I did the same and had the same results and it never returned. The third one was a Fender Thinline Tele I once had that I would chalk up to shoddy fret work as it was always like that, and I never had it happen on a neck that was finished.