Does a replacement part's model no. have to match exactly?

I have to replace a video cable in my laptop, and I'm trying to find the part. Matching my original part's model number seems a little tricky, as this particular part seems to have 6-10 different model numbers available. All these parts seem to look the same, and all the vendors say they work for any laptop in the particular laptop series, yet have a slightly different model number (ex. ABC 123.456 vs. ABC 123.457 vs. ABC 123.567). Does it matter at all if I get one with a slightly different model number, or could it risk not functioning properly if it doesn't match exactly?