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Dagmawit Moges said the investigators had retrieved all the relevant data in the black boxes.
Moges did not provide additional details about the alleged "similarities" between the two accidents, but stated that they would be "subject to further investigation".
Ethiopian Airlines Flight 302 crashed on March 10, six minutes after take-off, killing all 157 pbadengers. This was the second disaster involving a new Boeing 737 Max 8 aircraft in less than six months.
In October, the 189 pbadengers on Lion Air Flight 610 were killed when the flight flew over the Java Sea in Indonesia 13 minutes after take-off.
Investigators suspect that the Lion Air accident could have been caused by an attack angle sensor located outside the aircraft, which allegedly transmitted incorrect data, which could have triggered an automated flight software called maneuvering feature enhancement system, which forced the aircraft to nose down. .
According to a preliminary report on the accident, the pilots first manually corrected the "automatic dive of the aircraft" two minutes after take-off, then repeated the same procedure before the aircraft began to sting in the Java Sea, says the report.
On Sunday, following Mr Moges' remarks, Boeing Chairman Dennis Muilenburg issued a statement that the company "continues to support the investigation and is working with the authorities to evaluate the new information as it becomes available." ".
Mr. Muilenburg added that the company "is currently finalizing the development of a previously announced software update, which will address the behavior of the MCAS flight control law in response to erroneous sensor inputs".
Tewolde GebreMariam, CEO of Ethiopian Airlines, has previously stated that the pilot of Flight 302 had "flight control problems" shortly before the aircraft crashed.
"He was having trouble with the flight control of the plane, so he asked to return to the base," said GebreMariam. Permission was granted to the pilot when the flight disappeared from the radar.
CNN's Anna Cardovillis reported in Addis Ababa, while Dakin Andone told and wrote the story in Atlanta. Thom Patterson from CNN contributed to this report.
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