Sorry i cant seem to find, and if I'm in the right place its a bunch of jiberus lol. I will upload the file here if you can show me which folder its under.
In your Mincraft folder there Should be a file named config inside there's going to be a text file for each mod, each mod controls it's ID's separately so you will need to figure out what ID's are in conflict and decide which mod should get it's ID changed.
For instance just an hour ago I updated RoC and ReC and the ID for the turbine multiblock was in conflict with magic farm coal seeds so becasue it was the ReC update that caused the conflict I changed the turbine ID in ReactorCrafts config to something free. Actually there was a text file as I described that showed me the conflicts and even a suggested ID range for free ID's.
I know it sounds technical but it's really not.
PS: Also be careful of uploading files relating to mods the modders may not appreciate it.