I can't speak to Ho Chi Minh, but Stalin had different ideologies than Mao and Kim.

Stalin and the Russians/Soviets created Comintern, or Communist International. Founded in 1919 by Lenin, it's goal was to create a worldwide communist party. Naturally, the Russians and their successors, the Soviets, were the center and leader of this party and they were attempting to create more communist states. Stalin dissolved Comintern after the outbreak of World War II. Officially, the dissolution was due to the increasingly unique situation in each individual country that an international single party couldn't adequately address, however it's been claimed that the dissolution was to appease the Allies who were suspicious of the Soviets.

After the war, Cominform, or the Communist Information Bureau was created. Officially, it was not a successor to Comintern but it did share a common goal of world communism. The headquarters was initially in Yugoslavia but when Tito became too much for the Soviets to deal with, Yugoslavia was kicked out and the headquarters moved. This is a good indicator that the true purpose was not necessarily information as much as control. Which brings up the Asians...

Kim and Mao were both nationalists through and through and they used communism as the vehicle to reach their goals. Again, I don't know much about Vietnam, but I've read a few good articles that point out that Asian communism is done more for convenience than for ideology and that's definitely the case with China and Korea and this is where the trouble lies. Stalin wanted to exercise control over the entire communist world. Mao wanted to build a strong China to stand up against Japan and the United States, his two enemies, and to put China back in it's rightful place, the center of the Asian world. Kim wanted to unite Korea under his rule. This led to very awkward alliances. Mao and China needed support and they got it from the USSR but it was not as much as they had wanted and Mao got it by being treated poorly on his trip to Moscow and by toeing the Communist party line. However, by the late 1950's, relations soured. The Soviets were willing to negotiate with the West, talking with Eisenhower, while the Chinese were hostile to the idea. When Gary Powers was shot down over the Soviet Union and Eisenhower refused to apologize, the Soviets took it in stride while the Chinese considered it an insult to all communist countries. While all of these things happened after Stalin's death, they show that Mao and the USSR had different views of what communism should be.

Kim used this mistrust to play the two sides against each other. North Korea received aid from both sides, both sides wanted to keep Korea within their sphere of influence. Kim was able to keep this up until the fall of the Soviet Union, prolonging Korea's foreign aid until it dried up with the collapse of communism and the thawing of relations between China and the former Soviet republics.

TLDR - Stalin, Mao, and Kim didn't share the "communist" ideology. Stalin believed in his version of communism, what we now called "Stalinism", China simply used communism as a vehicle to push their nationalist agenda, while North Korea did a mix of the two, pushing Korean nationalism while building a brutal cult of personality around the Kim family. European and Asian communism and interpretations of communism have always been very different.