Residual value determination of insurance by residual value exchange?

Hello, had an accident without fault. The opposing insurance has set the replacement value to 7500 euros and the remaining value to 2880 euros. To get to the 2880 euros, my car was put in for a day at “AUTOonline” and a dealer has offered 2880 euros. So far so good, but can the insurance take this simply as the residual value? That the dealer pays so much, does not mean that the car is actually worth so much, doesn’t it? An independent expert has the However, he only gave 6300 euros as replacement value. Of course, I would like to have the highest replacement value and the lowest residual value. So a mix of both… Have a bit of panic now, that if the opposing insurance sees the report from the independent expert, the data changes in their favor. So lowers the replacement value… is that possible?