Choushinsei Flashman (1986)

It's the very first Super Sentai series what made many of it's successors possible. If you want to watch the original first season of the Super Sentai series. Choushinsei Flashman is the 10th Season.

Both feature rangers that were kidnapped as kids
Both grew up to become rangers to fight their captures
Both have same color pallet(except for orange and purple) team
Both were later followed up by a "Asian Theme" series
Both feature a humanoid main villain

It's the 9th sequel of the series from Super Sentai right after Dengeki Sentai Changeman which is the 8th sequel. If you would like to watch the super sentai series chronologically.

It's the 10th sequel of the series from Super Sentai right after Choushinsei Flashman which is the 9th sequel. If you would like to watch the super sentai series chronologically.