Clearly the first thing is that they all motivate

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You can then talk about how Locke's goal setting theory encourages feedback and recognition (as does Herzberg and Maslows, however at different stages Maslow being in the esteem stage and Herzberg as a motivating factor).
The factors that leads to positive job attitudes do so because they satisfy the individual's need for self-actualisation in their work (Herzberg and Maslow)
Both Herzberg and Maslow theories base their motivation on fulfilling human needs (instrinsic sorta). Both theories are hiearchal where the bottom level must be met before the above levels can be satisfied (to the fullest)
Herzberg and Locke base their theories on achievement and recognition of employee goals, and the work itself. Both theories are two-way meaning employees are more likely to negotiate tasks with the manager and are also more likely to be motivated to achieve them
that's all i can think of atm