Shuriken Sentai Ninninger (2015)

While one is a family of ninjas and the other is a family of magicians, the two series did still share a common trait which is a team of superheroes that shared familial bonds with each other who fights enemies who were born from the darkness as they try to cope with their every day lives. Not to mention there's a Magiyellow cameo as well as a sort of Magiranger parody in this. So if you like Ninninger or Magiranger when you watched it, you should be able to enjoy the other series as well.

Both 10 years apart
Both have family rangers
Both have a dad ranger
Both feature a magic ranger
Yellow Magiranger guest stars in a episode

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.

It's the 38th sequel of the series from Super Sentai right after Ressha Sentai ToQger which is the 37th sequel. If you would like to watch the super sentai series chronologically.

It's the 39th sequel of the series from Super Sentai right after Shuriken Sentai Ninninger which is the 38th sequel. If you would like to watch the super sentai series chronologically.

Both are Super Sentai series
Both are Ninja themed
Both have their ninja rangers start off as students that still have a lot to learn
It had two members show up in it

Both are Ninja themed
Both have a female white ranger, a male red, blue and yellow ranger
Both fight against demons
Both are Super Sentai series
Both met in a crossover

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

Both are family focused seasons of Super Sentai that tend to favor the more eccentric, loud and camp side of the series. While that doesn't mean that they don't also have deep themes buried in there, the two shows are best enjoyed when you're just looking for a good time.