DS-156/157 applications process

[OSgirl]

Hi everyone,

I'm back and happy to say we got approved and they sent my fiance his papers to fill out. However when i filled out my forms here I spelled his last name Mosbah and he just now tells me that there are two ways to spell it depending on classical and modern. His passport has Misbah. Does the different spelling make a difference? Will it delay us finishing and getting the interview ? If it is a problem are their forms we can fill out to correct it?

anyhelp is appreciated

Thanks again for all the help you guys and gals have given so far