A:AnswerNormally both TV brackets should be the same dimension.
If you feel different, you can tighten the safe bolts based on the step 6 of the user manual.
David M. - Dynex Support
A:AnswerYes, I believe so. Vertical spacing of the mount is controlled by the holes in the metal plates. The horizontal spacing is completely adaptable to your TV. I have a Samsung 4K HDTV with VESA 400x400 which it fits no problem.