Simple enough you've got most of the logic there.
- This is for the vehicle sharing the same model name. Check by going into the model directory in dlc.rpf\x64\vehicles.rpf
Go into the models within the dlc.rpf e.g. mods\update\x64\dlcpacks\r35\dlc.rpf\x64\vehicles.rpf\
You'll see the models in there rename them something else e.g. if they are r35 maybe call them r35x.
If tuning mods are present rename them as well. dlcpacks\r35\dlc.rpf\x64\vehiclemods so i'd rename them to r35x_mods.rpf from r35_mods.rpf
Next go to where all the text files for the vehicle are kept e.g. mods\update\x64\dlcpacks\r35\dlc.rpf\data
Here you wanna open and edit the names of the car in the files to what you have named them e.g. Open Handling-change <handlingName>r35</handlingName> to <handlingName>r35x</handlingName> then save and close. It's the same with all the text files you find in there with the old model name.
Off the top of my head it's Carcols.meta, Vehicles.Meta, Handling.meta, Carvariations.meta.
Lastly you want to go back to the beginning of the add-on and find content.xml and setup2.xml
In content.xml :
Change all the entries so they look like this and dont forget the tuning mods name needs to be changed as well.
and in Setup2.xml :
The last thing to do from here is change the name of the folder of the addon e.g. if the folder that contained the dlc is called R35 rename it to what you did in the content.xml and setup2.xml after that edit the dlclist to reflect the new name.
If you've simply got a car with different models but the same mod folder name e.g. Vans123 mods all you have to do is :
- Change the name of the folder of the addon e.g. if the folder that contained the dlc is called Vans123 rename it to Vans1231
- Go into the dlc and open content.xml and setup2.xml in this case i'd find all the entries saying Vans123 and add the 1 on the end to match the dlc folder name of Vans1231.