Hello Mara.
Can you take a photo of the lettering on your existing part?
You are correct that N9005 is the right model number for your device. Not ALL Samsung models end with a letter.
If you were to find a part labeled N9005 it would be usually be correct. But sometimes, rarely, samsung uses multiple revisions of part. The "rev#.#" will be printed on the flex with your n9005 model number.