Congolese spokesman Lambert Mende told Top Congo FM that the bodies were found today but did not confirm they were of Michael Sharp of the United States and Zaida Catalan of Sweden.
"To our knowledge, there are no other foreigners who have disappeared in this region," Mende said, adding that the provincial commissioner was on his way to recover and identify the bodies of two Caucasians and a Congolese.
"Since no other Caucasians have been reported missing in that region, there is a high probability that these are the bodies of MJ and Zaida," he wrote. "Dental records and DNA samples will be used to confirm the identities. This will take some time.
"All other words fail me."
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A UN spokesman in New York said the UN was analyzing the remains and could not confirm the identities of the dead as yet.
Their disappearance is the first time UN experts have been reported missing in Congo, Human Rights Watch has said, and it is the first recorded disappearance of international workers in the Kasai provinces.
Parts of Congo, particularly the east, have experienced insecurity for decades, but violence in the Kasai provinces in central Congo represents a new expansion of tensions.
The Kamwina Nsapu militia has been fighting security forces since last year, with the violence increasing after security forces killed the militia's leader in August. More than 400 people have been killed and more than 2,00,000 displaced since then, according to the UN.