No, it’s a loan on completely different terms. The original contract is no more - it was replaced in its entirety as soon as you fixed.
Again, the original contract was replaced in its entirety when you fixed - you are relying on the term of a contract that no longer exists.
But there was no new contract. No new terms. No new application. No new signatures. No lawyers. Its's the same account number. Why would it be considered a "new" loan? What are you basing this on? Does this mean every time I change the repayment date, I am getting a new loan?