Use pm2 and specify the node version using the --interpreter flag with an absolute node version path:
sudo pm2 start app.js --interpreter=/home/ken/.nvm/v4.4.2/bin/node
or
sudo pm2 start app.js --interpreter=/home/ken/.nvm/v7.4.0/bin/node
etc..
If you change the version of the node wherever I mentioned --interpreter="***.." application will work with the exact version of the node.
After you have completed the above approach, to check, use the following command
sudo pm2 show 'app name'
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