Role of a difference in generating symmetric palindromes

Question

An example : 923456781-123456789=799999992

Now divide it by the difference between the terminal digits, i.e. 9-1=8

So 799999992/8=99999999

Another example : 52314780-02314785=49999995/5=99999999

But if we do : 799999992/9=88888888 and 49999995/9=5555555

So either the difference or 9 itself help in generating symmetric palindromes

Can this be generalized?

Also refer to Super palindromes and 9 hidden in every number regardless of number of digits?