If you have a valid TDL then obtaining a DVT would not invalidate that or somehow change it to 2 yr licience.
However when you go to renew your license then it will be 2 yr
Initial TDL is 2 years and DTV is tourist status and 2 yr TDL can be obtained.
Immigration in Bangkok no longer require a TM47 to obtain a certificate of residence (recent change).
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