Is a skeletal x ray survey same as dexa scan?

No. A skeletal x-ray survey and a DEXA scan are not the same.

Skeletal x-ray survey focuses on the bones and joints. It is used for diagnosing fractures, infections, arthritis and some developmental disorders.

DEXA scan, formally known as dual-energy x-ray absorptiometry measures the amount of bone mineral content (BMC) and can assess fracture risk.

Although both skeletal x-ray and DEXA scan may be performed on the same day the studies are fundamentally different.