I'm hoping someone can point me into the right direction because I know next to nothing about physics (animation major pls no bully). I'm looking for the encompassing concept in physics I need to study to be able to answer this:

Say I have 3 blocks of varying softness and hardness. If I sandwich them against a wall, will the middle block (red/B) always feel an equal amount of force coming from the two sides that is sandwiching it (block A and block C)?

Are there rules/laws for this? I've been browsing materials on compression, deformation, and springs but I'm a little overwhelmed. Where should I start learning about this?