Engine Sentai Go-Onger (2008)

It's the 31th sequel of the series from Super Sentai right after Juuken Sentai Gekiranger which is the 30th sequel. If you would like to watch the super sentai series chronologically.

It's the 32th sequel of the series from Super Sentai right after Engine Sentai Go-Onger which is the 31th sequel. If you would like to watch the super sentai series chronologically.

Both are a sentai team that has their foreign, sentient mechs pick human partners to fight evil. (Engines are from another dimension, Kiramai Stones are from another planet)

Both have their mechas be based on vehicles of some sort. This can range from Cars to Planes to Choppers to Trains.

Both start not having the core team complete and getting the rest very early on in the show. (Go-On Green and Black and Kiramai Red) before getting the sixth ranger/s (Go-On Wings and Kiramai Silver)

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 not so serious tones
Both are car themed
Both have rangers that are (red, blue, green, and yellow)

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.