ZoneDoctor WoR Desert battle background

It is background $2F. If you want to have it on a map, you have to edit manually location properties. They are located at $ED8F00. To get to the right byte, do map ID * 33 + 2 + $ED8F00.

I'm not sure if you're asking how to put the WOR desert palette on the WOB desert background. If so, you have to edit the Battle Background Data at $E70000. Battle background $2F use palette $34. WOB deset is background $02. The right offset should be $E70011. Replace this byte by $B4 since the $80 flag is for wavy effect.