Does having a new passport number affect my 90-day check-in in Thailand after a visa extension?

Nothing changes

𝗧𝗵𝗶𝘀 𝗾𝘂𝗲𝘀𝘁𝗶𝗼𝗻 𝘄𝗶𝗹𝗹 𝗯𝗲 𝗮𝗯𝗼𝘂𝘁 𝗮𝗻 𝘂𝗻𝘂𝘀𝘂𝗮𝗹 𝟵𝟬 𝗱𝗮𝘆 𝗰𝗵𝗲𝗰𝗸-𝗶𝗻 𝘀𝗶𝘁𝘂𝗮𝘁𝗶𝗼𝗻.

Not all that unusual in the grand scheme of thingz 😛

𝗠𝘆 𝗻𝗲𝘅𝘁 𝟵𝟬 𝗱𝗮𝘆 𝗰𝗵𝗲𝗰𝗸-𝗶𝗻 𝗶𝘀 𝗱𝘂𝗲 𝗶𝗻 𝟮𝟰 𝗡𝗼𝘃𝗲𝗺𝗯𝗲𝗿.

Then if you haven't left the country on or by that date you do a 90 day report

𝗜 𝗷𝘂𝘀𝘁 𝗿𝗲𝗻𝗲𝘄𝗲𝗱 𝗺𝘆 𝗽𝗮𝘀𝘀𝗽𝗼𝗿𝘁 (𝗻𝗲𝘄 𝗻𝘂𝗺𝗯𝗲𝗿), 𝘁𝗵𝗲𝗻 𝗜 𝗿𝗲𝗰𝗲𝗶𝘃𝗲𝗱 𝗺𝘆 𝗼𝗻𝗲 𝘆𝗲𝗮𝗿 𝘃𝗶𝘀𝗮 𝗲𝘅𝘁𝗲𝗻𝘀𝗶𝗼𝗻, 𝘄𝗶𝘁𝗵 𝗺𝘂𝗹𝘁𝗶𝗽𝗹𝗲 𝗲𝗻𝘁𝗿𝘆 𝗽𝗲𝗿𝗺𝗶𝘁.

(y)

𝗜'𝗺 𝘃𝗶𝘀𝗶𝘁𝗶𝗻𝗴 𝗦 𝗞𝗼𝗿𝗲𝗮 𝗳𝗼𝗿 𝗮 𝗳𝗲𝘄 𝗱𝗮𝘆𝘀 𝗻𝗲𝘅𝘁 𝘄𝗲𝗲𝗸, 𝗿𝗲𝘁𝘂𝗿𝗻𝗶𝗻𝗴 𝘁𝗼 𝗧𝗵𝗮𝗶𝗹𝗮𝗻𝗱 𝗼𝗻 𝟮𝟰 𝗢𝗰𝘁𝗼𝗯𝗲𝗿.

Then your NEXT 90 day report will be due 89 days from the date you stamp back into thailand (or on Jan 21st)

𝗜 𝗸𝗻𝗼𝘄 𝘁𝗵𝗮𝘁 𝘂𝗻𝗱𝗲𝗿 𝗻𝗼𝗿𝗺𝗮𝗹 𝗰𝗶𝗿𝗰𝘂𝗺𝘀𝘁𝗮𝗻𝗰𝗲𝘀, 𝗺𝘆 𝗳𝗶𝗿𝘀𝘁 𝟵𝟬 𝗱𝗮𝘆 𝗰𝗵𝗲𝗰𝗸-𝗶𝗻 𝗮𝗳𝘁𝗲𝗿 𝘃𝗶𝘀𝗮 𝗲𝘅𝘁𝗲𝗻𝘀𝗶𝗼𝗻 𝗺𝘂𝘀𝘁 𝗯𝗲 𝗱𝗼𝗻𝗲 𝗶𝗻 𝗽𝗲𝗿𝘀𝗼𝗻

That is not correct, only the very FIRST 90 day report when you start getting year extensions has to be done in person, after that you can do online even when you get a new year extension

𝗔𝗡𝗗

𝘁𝗵𝗲 𝗰𝗹𝗼𝗰𝗸 𝗿𝗲𝘀𝗲𝘁𝘀 𝗼𝗻 𝘁𝗵𝗲 𝟵𝟬 𝗱𝗮𝘆 𝗰𝗵𝗲𝗰𝗸-𝗶𝗻 𝗳𝗿𝗼𝗺 𝘁𝗵𝗲 𝗱𝗮𝘆 𝗜 𝗿𝗲𝘁𝘂𝗿𝗻 𝗳𝗿𝗼𝗺 𝗞𝗼𝗿𝗲𝗮, 𝗺𝗮𝗸𝗶𝗻𝗴 𝘁𝗵𝗲 𝗻𝗲𝘄 𝗶𝗻-𝗽𝗲𝗿𝘀𝗼𝗻 𝟵𝟬 𝗰𝗵𝗲𝗰𝗸-𝗶𝗻 𝗱𝗮𝘁𝗲 𝟮𝟰 𝗙𝗲𝗯𝗿𝘂𝗮𝗿𝘆.

Where did you get that date from, google says Adding 89 days from Thursday October 24, 2024 is Tuesday January 21, 2025

𝗦𝗶𝗻𝗰𝗲 𝗜 𝗵𝗮𝘃𝗲 𝗮 𝗻𝗲𝘄 𝗽𝗮𝘀𝘀𝗽𝗼𝗿𝘁 𝗻𝘂𝗺𝗯𝗲𝗿, 𝗱𝗼𝗲𝘀 𝘁𝗵𝗮𝘁 𝗰𝗵𝗮𝗻𝗴𝗲 𝗮𝗻𝘆𝘁𝗵𝗶𝗻𝗴?

Yep, you have to do the next 90 day report IN person on a new passport, AND you need to file a new TM30 (if you haven't yet) under the new passport too