This question is a little tricksy because the two things being compared are not real counterparts of each other, but this is the easiest version of the question in terms of resolution and also, perhaps, perception.
The Artemis Accords are agreements between the US and other countries on norms in space. However, signing the accords is a prerequisite for involvement in the Artemis Program (the US lunar programme).
https://en.wikipedia.org/wiki/Artemis_Accords
The ILRS is a project to create a international cooperation on (or around) the Moon. My understanding is that joining countries sign an agreement with China.
https://en.wikipedia.org/wiki/International_Lunar_Research_Station
Resolves YES to any countries that are listed as members of both on Wikipedia. If there is any ambiguity (as is currently the case with UAE), the key point will be whether a country is included in whatever seems to be the 'main list' on the article, and whether is sticks there as opposed to being briefly added in an edit war
Question closes after the next person walks on the Moon, or if both the Artemis Accords and the International Lunar Research Station are formally closed down.
1,000Thailand is listed in the main membership tables of both named Wikipedia articles. NASA records its Artemis Accords signing on 16 December 2024, and CNSA records the ILRS cooperation memorandum on 5 April 2024:
NASA Welcomes Thailand as Newest Artemis Accords Signatory - NASA
https://www.cnsa.gov.cn/n6758823/n6758838/c10496980/content.html
Can Thailand resolve YES early on that basis, or does the answer need to wait for the next Moon walk or the other event-based close?