American and British diplomats finished their first series of talks in Rhodesia yesterday with indications that a major dispute is developing over the issue of voting requirements, Washington Post special correspondent Robin Wright reported.

Although Prime Minister Ian Smith has accepted majority rule in principle - and has made some apparent concessions - Rhodesian officials remain hard-nosed about the "size of the majority, according to informed sources here. The Rhodesian appears willing to lower the current education and property requirements that qualify a black to vote, but not to implement the principle of one-man, one-vote as demanded by black nationalist leaders and the British government according to a diplomatic source.

During the three days of talks between the Rhodesian and the Anglo-American team, however, it appears that the Rhodesians agreed that there would be no significant transition period between white and black rule, during which the terms establishing majority government would be worked out.

This would eliminate many of the basic disputes that led to the breakdown of the Geneva talks on Rhodesia's future. Those talks stalled on questions such as control of ministries during transition and makeup ruling councils during the period.

Meanwhile, UPI reported that a Rhodesian government official likened U.S. Ambassador to the United Nations Andrew Young to Ugandan dictator Idi Amin, saying: "They both would have been clowns were the world problems not so tragic. Their utterances would have been funny were they not so dangerous, pathetic, or their effect so serious, said Rowan Cronje, minister of manpower and social affairs.

It was the third time in five days the Rhodesian government attacked Young, who visited South Africa a week ago.