We expand $ (ac + bd)^2 + (bc - ad)^2 $ : \begin{align*} (ac + bd)^2 + (bc - ad)^2 &=(ac)^2 + 2(ac)(bd) + (bd)^2 + (bc)^2 - 2(bc)(ad) + (ad)^2 \\ &=a^2c^2 + 2abcd + b^2d^2 + b^2c^2 - 2abcd + a^2d^2 \\ &=a^2c^2 + b^2d^2 + b^2c^2 + a^2d^2 \\ &=a^2c^2 + b^2c^2 + b^2d^2 + a^2d^2.\end{align*}Now we can factor out $ c^2 $ from the first two terms and $ d^2 $ from the last two terms and we get: $$a^2c^2 + b^2c^2 + b^2d^2 + a^2d^2 = c^2(a^2+b^2) + d^2(b^2 + a^2).$$Now we use distributive property and we have $$c^2(a^2+b^2) + d^2(b^2 + a^2) = (c^2+d^2)(a^2+b^2) = 4\cdot 3 = \boxed{12}.$$