Reduction of the painting costs by equivalent insurance right?

Hello, it is about an accident without fault, in which a repair report was made by an expert. The amounts listed there are communicated to the opposing insurance and taken as the basis for calculation. Today there is the letter of the same insurance, where among other things the wage costs for painting work with reference to a comparison workshop were reduced by more than 100 €. Likewise, the wage costs for bodywork and mechanical work with the same In the search I have found posts, where (at least in relation to the hourly rates) this is presented as wrong. Is that actually the same (was older contributions)? If yes, would a reimbursement have to be made here by the corresponding insurance? Are there legal judgments to which one can rely and which of the opposing insurance clearly and clearly point out my legitimate concern (possibly even without involvement of a lawyer)? Thank you and greeting Martin