The Pacific Ocean was contaminated down to Hawaii after Fukushima. On the other hand, Chernobyl caused massive atmospheric conmamination in Eurasia. Fortunately tech was in place and dangerous clouds were mostly brought down in Bryansk region. Good for Poland, winds blew to the East.
You cannot directly compare the magnitude and severety of consequences, but you can compare organisation and effectiveness of countermeasures. The Soviet Union in this was far more advanced country than modern Japan.
>The Pacific Ocean was contaminated down to Hawaii after Fukushima.
Which was meaningless unless you were closer than about twenty miles at the worst. The fact that you can measure it is irrelevant.
Crops were contaminated by Chernobyl, and people ate those crops.
Light water reactors are inherently safer - the Japanese never had to deal with a fire you couldn't put out with water and they never had to deal with fly ash.