Paste your code.
I hope your code is controlled by the source code (if not, start now!), You should go from the base to the "Customer X" branch and just make small cosmetic changes in this branch. Then just create and expand this branch for this client.
In addition, if the changes are small enough, you can try to change the settings. Thus, you can deploy the same site everywhere and just change the configuration to suit what the client wants. The more complex the differences, the more difficult it will be to set them up.
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