Genesis3 surface => UDIM tile mappings

For Genesis3 surfaces, will a given surface always have the same UDIM tile number (e.g. 1002) for all UVSets?   For instance, will the Torso surface always have UDIM tile 1002 for any UVSet (Victoria 7/Karen 7/etc)?   Or can UDIM tile numbers vary between UVSets for  given surface?

If the mapping isn't static, is there any way to lookup the UDIM tile number for a given surface/UVSet via the scripting interface or SDK?

Thanks