The general election should be an interesting means to determine which racial minorities Republicans in California dislike more: will they vote for the Black woman with the Anglo last name or for the Mexican lady? I don't buy that ideology will play a big factor in this choice.
I think you're forgetting that Harris at least has an Obama like demeanor to her, Sanchez has a "take no prisoners" sort of rhetoric.
Now normally, that brash, off-the-cuff style in this type of climate would probably endear the remaining Republicans more towards Sanchez. But the whole "build a wall" thing is probably gonna make 'em not so happy towards someone challenging them harshly.
The way I've heard it described is that Harris is patrician and Sanchez is.... the exact opposite.