Thank you for your help.
John I even had his software registered, I bought it years ago.
I could not remember how to use it, but now it's clear.
So what I'm going to do is:
1. Open the folder containing the DNG, export to the native RAW in the same folder.
2. Synchronize the folder with LR
3. Use syncomatic to synchronize all treatments, as the names are not the same, the solution is to use the time option to synchronize.
I did the test here and it works perfectly, a bit of work, because I have something 70,000 images and some 250 folders, but it's the price I'll pay to take everything to DNG.
At least I was careful to preserve the original RAWs, something that some friends did not have and now they do not have RAW anymore.
Thank you.