however, the thing israel wants to be a little careful about is the difference in population size, but that itself comes with some clarification.
remember: we don't know if israel has nukes or not. we think they do.
in a very long slog, iran could potential just out-die israel, and the truth is that they are crazy enough to perhaps try. that's the caveat for israel; if iran is in this until the end, killing 15x as many iranians as there are israelis may be a challenge.
yet, if you add up active + reserve (that is trained soldiers), it's actually more or less even, which says a lot about israeli culture and miiltary preparedness. despite the fact that iran's population is 10x as large, israel can put as many armed soldiers on the ground, and they are without question better trained.
but, this is almost certainly a moot point. any actual war is going to be fought in the air, and iran is going to get quickly obliterated.