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Look at the table I linked you to, that should show you what the phrase: "first six characters" means.
There is no reason to post more than the first six characters, consider the rest of the serial number "private".
You now know two things:
Your model is one of those covered by this thread.
The current firmware is one of those covered by this thread.
Q.E.D: You are in the right place.
Yes, you must flash a different system image.
It is not the version number (which happens (by chance) to be the same), it is the build options it was created with that make a difference.
What is on your device now is a "customer use" firmware build, what you will be putting on it is a "factory use(-only)" firmware build.
It is a requirement to the over-all process.
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