I don't doubt that there are many zionists among the democrats but I think it's pretty obvious that there's a difference in the type of jews that support either party, with neocon jews being myopically focused on israel, and international-socialist jews being focused on jewish power more globally even at the expense of israel. There are even quite a few jews who are not even zionists, which is why it's a mistake to conflate the two labels.
The Democrats are just as zionist though. Their leader is a literal Jew (Schumer).