The difficulty of usual (non-levered) body-weight exercises (such as pull up) is independent of the person’s height. For example, comparing a person that weights 90kg with another that weights 60kg, the heavier person has to be 50% stronger [90/60].
But for levered body-weight exercises (such as front lever) the difficulty also depends on the person’s height. For example, comparing a person that weights 90kg and is 190cm tall with another that weights 60kg and is 160cm tall, the heavier and taller person has to be 78% stronger [(90/60)*(190/160)].