How similar are your MCs appearances, interests, personalities, tastes etc.?
I'll start with the female leads from two of my novels "Damsel in the Red Dress" and "A Dozen Morning Glories."
Alicia's appearance/body type is this:

Essence looks like this (except that her skin is not shaded here)

Alicia is very short, very curvy, a little chunky, and though you can't tell from the sketch, she's cinnamon brown. She has extremely long (down to her knees) curly hair, somewhere around 3b-3c in texture. A round nose, thick eyebrows, a round face, rather large eyes with long doll-ish lashes, and full lips.
Essence is tall, very thin, without nearly anything in the way of curves, and (though you also can't tell from the picture) her complexion is canonically nearly literally black. She had medium length hair which reaches a bit past her shoulders when cornrowed, and it's 4C in texture. She has a round nose, but it's broader than Alicia's. Her eyebrows are about average, but leaning toward thin, a more square face, though both have small faces, she has very sharply slanted, slightly sleepy eyes, and she has full lips as well. Her lashes appear long, but that's just makeup lol. Naturally they are average length and thickness, but they do naturally stand out distinctly from each other.
Pretty different looks wise. I'd give them an 8/10 difference ranking aesthetically.
Personality-wise, Alicia is very emotion-centered and driven. She feels very strongly and let's her emotions guide and control her at times. Essence feels nothing.
I rank this as a 9/10 difference, because both of them do still suffer from depression, which is a guiding factor for their responses to the world.
Careers:
Alicia is a painter and Essence is a developmental editor for romance novels.
Since they both work in creative fields based on fancy and whimsy, and are considered very talented/skilled in their work arenas, I'll rank them a 3/10 difference.
Interests and tastes:
Alicia is really into painting, poetry, and old music. She loves the color red, and other vivid warm colors, baked goods, and physical affection.
She spends most of her days lounging around her house if she isn't painting, texting or visiting her friends, or going to work with a museum, magazine, journal, etc. Or arranging schedules with her agents.
Essence spends all day working. No hobbies. Most of her days include working on the novels she edits, but she also buys groceries for her mother and washes and braids her mother's natural hair for her, since her mother can't care for this herself. She doesn't wear really vivid colors because she finds them garish against her complexion. She tends to stick with darker and muted blue tones. She doesn't have much taste in food, but sweet foods are a little less pleasant for her because they coat her tongue oddly often times and physical sensations are one of the few she can still feel, however dulled. She also doesn't like being touched.
i'll rank them a generous 3/10 match here.
I'll replace these images of the leads with better ones when I can make some better art XD. For now, do you think there are any comparisons I should add? Suggest your own character comparisons and compare the characters from your stories that play comparable or equivalent roles in their respective books (antagonists, male leads, female leads, best friends, parents, etc.)
Alicia's Story
Essence's Story: