Reference & Pointers questions

Question

The following questions might have been asked already. In addition, I am aware of the fact that there are a lot of posts that discuss the topic. However, after searching, I couldn't find answers to those specific questions.

Note: the questions appear under the code.

The code:

#include <stdio.h>

#define ARRAY_SIZE 3

typedef struct
{
    const char* name;
    const char* color;
    int age;
}Cat;

void printCat1(Cat* cat)
{
    printf("\n%s\n", cat->name);
    printf("%s\n", cat->color);
    printf("%d\n", cat->age);
    printf("\n");
}

void printCat2(Cat cat)
{
    printf("\n%s\n", cat.name);
    printf("%s\n", cat.color);
    printf("%d\n", cat.age);    
    printf("\n");
}

void printCatArray(Cat catArr[])
{
    int i = 0;
    for (i = 0; i < ARRAY_SIZE; i++)
    {
        //WHICH OPTION IS BETTER? (printCat1 OR printCat2)
        //CALLING TO PRINTING FUNCTION.
    }
        
}

void swap(Cat cat1, Cat cat2)
{
   Cat temp = cat1;
   cat1 = cat2;
   cat2 = temp;
}

void sortbyage(Cat catarr[])
{
    int i, j;
    for (i = 0; i < ARRAY_SIZE - 1; i++)
      for (j = 1; j < ARRAY_SIZE; j++)
        if (catarr[i].age > catarr[j].age)
            swap(catarr[i], catarr[j]);
}
int main() {
    Cat catArray[ARRAY_SIZE] =
                { {"cat1", "white", 1},
                  {"cat2", "black", 2},
                  {"cat3", "gray", 3} };

    printCatArray(catArray);
    

    return 0;
}

The questions:

1. What is the difference between both functions that print the data of a single cat structure?
2. Which printing function is better to use and why? it will be essential and meaningful if you would like to explain.
3. What is better to write and why? void swap(Cat cat1, Cat cat2) OR void swap(Cat* cat1, Cat* cat2)
4. Is the calling to swap function from the function soryByAge, swap(&catArr[i], &catArr[j]), correct? Would you write it differently?
5. The following line of code is correct: catArray[2] = catArray[1]; It will be great to get an explanation about what it actually does.

Note: except swap's declaration, I am not allowed to change the other functions' declarations.

If one or more of the questions are not clear enough, I will be glad to clarify them.

Thank you very much beforehand!