One word: no.
Titanic had a much broader interest than ROTS has worldwide. It was a one of, special movie about a very tragic moment in real history, people wanted to see that.
Titanic earned more than $20 million every week for almost two months straight. It was unprecidented. It was also released in the winter and had little competition after christmas. There is no way ROTS will come close. It will be lucky it it beats TPM and we will certainly know for sure in two weekends.