The issue is what you will do, you won't find the answer floating around on line.
It is up to YOU to prove the value of the car before the accident and what the value is after the repairs. If a reputable appraiser is able to establish your car was worth more with original paint (in the condition in which is was in) than repainted you may be able to recover diminished value. If the appraiser doesn't believe the car is worth less repainted then you don't stand much of a chance recovering diminished value. You need to be able to prove your loss. Then expect to be reimmbursed for those losses and the cost of a reasonable appraisal expense.
I would still pursue this my insurance company. Yes that settlement will be minus your deductible. But they are usually more open to negotiating with you. The once your insurance pays you, they go after the other insruance compnay. Once the other company settles you should be reimbursed your deductible.