Knowing the difference and how to improve each of these will allow you to train harder, smarter.
Your capability involves the weights you can lift, your technique on your lifts, the skills you can do and the times of your short duration conditioning.
Your capacity looks at percentage based repetition ranges of weighted movements, technical efficiency under fatigue, repetition ranges of skills and pace based longer duration conditioning.
Examining the correlation between these two categories can provide great insight into your strengths and weaknesses at a much deeper level than just the surface level numbers. The goal is to have good balance between your strength and strength endurance. If there isn’t, then it usually means one or possibly more of these three things…