Recommendations

Both are detective theme shows
Both have the same team color pallet
Both have crime organization villains

Both are fighting a dark ancient evil
Both have family rangers
Mother absent
Feature a "red dragon" villain

Both have family rangers
Both are fighting against ancient demons
Both have old mentors
Both feature villains that are related

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

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

Both have a evil scientist main villain
Both have a female pink and yellow ranger
Both yellow rangers are photographers

A movie based on the source material
A mystery crime movie with the cast
Came out the same year as the show

It's a follow up to Dekaranger
Shows what happened to the cast 10 years later
Cast and head writer returns

Both met and teamed up with Kyuranger and Gokaiger
Both are space detective series
A follow up movie

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

Both have the same color pallet teams
Both have rangers die in the season
Both feature monsters made from objects
Came out 10 years apart

Both have dark themes
Both are about martial arts
Both have red ranger dad that turned to the dark side
Both have ancient feud clans
Both have Chinese aesthetic

Both are space detectives
Both crossed over in a movie
Both appeared and teamed up with Kyuranger and Gokaiger

Both are Police themed series
Both are fighting against a crime organization
Both have a mix of both mature and silly tone
Police rangers are red, green, and pink

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)