If \(\left(3 x^2-1\right)\left(x^2-\frac{1}{3} x+\frac{13}{3}\right)+\left(\frac{19}{3}-\frac{x}{3}\right)\) = Ax⁴ + Bx³ + Cx² + D, where A, B, C and D are integers, then what is the value of (A - B + C - D)?