Probably you will need both forms, particularly if you continued to receive income from New Jersey sources.
Please see 2019 New Jersey Form NJ-1040 Instructions page 3 to determine your status. For part-year residents, it states:
There is no part-year resident return. You may have to file both Form NJ-1040 to report income you received for the part of the year you were a resident and Form NJ-1040NR if you had income from New Jersey sources for the part of the year you were a nonresident.
2019 New Jersey Form NJ-1040NR Instructions
How do I file a part-year state return?
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