Sema Ancient City is in Sung Noen district, around 30-40 kms before you reach Korat City.
Ban Prasat is in Non Sung district, head north from the city for 45 kms.
So both places is in diferent direction.
Ban Prasat is famous and they have a great homestay programe. They welcome alread many foreign visitors so no problem for english I think.
See photos from this link
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