No, I always runs in 16:9. But I believe Exynos 4412 should be able to handle 4:3 resolution. You can dig further in its manual : http://www.samsung.com/global/business/semiconductor/file/product/Exynos_4_Quad_User_Manaul_Public_REV1.00-0.pdf

I have hackberry board before. I can change resolution by modifying uboot and kernel. But I haven't changed Exynos.