Make a list of distinct positive integers that are obtained by assigning a different base ten digit from 1 to 9 to each of the capital letters in this expression.
(A-B)C + (C-D)E + (F-G)I
What are the respective minimum and maximum positive palindromes from amongst the elements that correspond to the foregoing list.
As a bonus, what are the respective minimum and maximum positive tautonymic numbers that are included in the list? How about the respective maximum and minimum negative tautonymic numbers?