There is no 3 day right to cancel a car purchase in NJ. Sorry. Here is where NJ stands on cancellations:
I assume HSBC holds the loan on the old car and you owe 17K+.
Here's the problem If you return it....it is a voluntary repossession. It is unlikely that the bank will take it and give you a full release of your loan. Check the loan contract, but like with any repossession, the bank sells it at auction...they get less than 17K and can sue you for the deficiency, getting a judgment against you which is an automatic lien on your house, land etc. and can be collected against assets like bank accounts. Wish I had better news.
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