Choujuu Sentai Liveman (1988)

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.

Both start with 3(Male Red and Yellow and Female Blue)
Both of the 3 were survivors of an attack at their school
Both villains are galactic themed
2 rangers join the team
The 3 rangers theme are (Falcon, Lion and Dolphin)

Both are 20 years apart
Both have the same color pallet team
Both have 2 rangers that join the team later and have their own mecha

It's the 11th sequel of the series from Super Sentai right after Hikari Sentai Maskman which is the 10th sequel. If you would like to watch the super sentai series chronologically.

It's the 12th sequel of the series from Super Sentai right after Choujuu Sentai Liveman which is the 11th sequel. If you would like to watch the super sentai series chronologically.