Yes I agree wholly with you without any difference, only the difference is of terms interpretation. See, stress is a distance between your present situation and targetted situation and the more distance it is, the more stress it is. You can also set analogy with the rubber band the more stretched it is, the more stressed it is and longer it is stretched, the elasticity is lost and when the elasticity is lost, the strength is also lost resulting into breaking of the thread. Sometimes, we ourselves set our targets so high as a result of jealousy, show-off, etc, we forget the present situation and when those targets are not achieved, the result is stress and post-failure disorders.
You may be referring stress to daily mental fatigue or exhaustion after long hours of distractionful and high concentrated jobs. This is right definition. If we go deeply, we will find that the stress in such circumstances again are rooted in lack of team spirit, selfish nature, non-practically set targets, race of leading in material world. These problems are all rooted in the lack of values of our soul. We need to strengthen the values which would secure us from the stress. No doubt, after mental disorders are developed in one's mind, it is not possible to treat through simple mental hygiene. It then requires cognitive behavioural therapy (CBT), Rational Emotive Behavioural therapy (REBT), and similar psychotherapies to train the mind to the desired outcome. May be I am somewhat incorrect, forgive me if I have crossed the limits.