Chouriki Sentai Ohranger (1995)

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 have a military theme
Both have the same team color pallet
Both star Hiroshi Miyauchi
Both are fighting an empire with brutal leaders and silly monsters

It's the 18th sequel of the series from Super Sentai right after Ninja Sentai Kakuranger which is the 17th sequel. If you would like to watch the super sentai series chronologically.

It's the 19th sequel of the series from Super Sentai right after Chouriki Sentai Ohranger which is the 18th sequel. If you would like to watch the super sentai series chronologically.

Maskman and Ohranger are almost like mirror versions of each other by having a lot of the same elements, but changing its prominence in the show.

They both are military teams that get their power from Ki energy and each member is a master of a different style of martial arts. But while Maskman is very showy with its martial arts and Ki energy, the military aspect is kept at a bare minimum. And while Ohranger very much knows that they are a military sentai, there is also not much gratuitous martial arts outside of actual battles.