On the surface, aside from having somewhat similar names, Ms. Marvel and Mr. Fantastic also seem like they have the same power: they can stretch their bodies into any shape to suit their needs. But I find the minute differences in how their specific powers are depicted to work actually pretty interesting. Because while Mr. Fantastic often focuses on being a weird spaghetti monster that can stretch and morph to uncomfortable effect, Ms. Marvel's shapeshifting more often takes the form of a change in her proportions.
Kamala's iconic move is to "embiggen" specific parts of her body for a power boost. With bigger hands, she can punch harder. With bigger legs, she can step farther. Richards stretches out, but his individual parts tend to maintain the same proportions, whereas Ms. Marvel will just turn into a giant or scale down to the size of a mouse. And you don't really get the sense he gets "stronger" when he stretches out. He's just more thin, if anything. Kamala's power is not so much about stretching as it is about growing and shrinking individual areas of her body as needed, where mass = force. According to The Lore she's actually time traveling her mass every time she grows or shrinks, but that's pretty out there. Kamala DOES sometimes do the stretch thing to wrap around enemies or dodge attacks, but even in those cases it feels more like she's adding mass, extending rather than stretching. Not so much stretched out as just longer. You get the sense that Mr. Fantastic acts like rubber, while Ms. Marvel is more like a Photoshop transform tool... They can still look pretty similar depending on who's drawing them, though.
