Differences between Shinka Gattai Daizyujin and the Dino Megazord

Daizyuzin 	Megazord
The red mecha was the only one to appear in the second episode, with the rest appearing in episode 3. They did not combine until episode 6. 	Zord components and their combined form all debuted together in the first episode.
The mecha are sentient guardian gods of several kingdoms of ancient human civilization. 	The mecha are robotic vehicles. No backstory is given.
The black mecha is a mammoth. 	The black Zord is a mastodon, which is an entirely different animal, as seen here.
The pink mecha is a pteranodon. 	The pink Zord is a pterodactyl, which is an entirely different animal, as seen here.
The combined form is the chief god of ancient mankind and the ultimate leader of the Zyurangers. Daizyuzin is able to act autonomously without a pilot. He is also capable of full human speech.	The combined form is just a robot, without any authority over the rangers. It did not display the ability to move without a pilot. The only vocal ability it seems to have are a few robotic announcements notifying the combination sequence is complete.
His name has no significant impact on Super Sentai. 	Started the trend in calling every combined robot in Power Rangers a Megazord.
Fought alongside AbarenOh & Kyoryuzin in Zyuden Sentai Kyoryuger vs. Go-Busters: Dinosaur Great Battle! Farewell, Eternal Friends. 	Fought alongside the Thundersaurus Megazord & the Dino Charge Megazord in Grid Connection.
Returned to heaven with the other Guardian Beasts after Bandora was defeated, as his task was completed.
Has no ties with the Mythical Chi Beasts from Dairanger or with Gasha Skull from Kakuranger.	Its components later gained the ability to turn into the Thunderzords. Those were destroyed by Rito Revolto at the start of the third season of Mighty Morphin' Power Rangers until 25 years later finally rebuilt.
Fought alongside several Mecha in Super Sentai World, various Red Ranger Mecha (with Guardian Tyrannosaurus briefly appearing separately) in Hyakujuu Sentai Gaoranger vs. Super Sentai, and most of the other main Super Sentai Robo's during the 199 Hero Great Battle crossover movie.
Also, the Guardian Beast Tyrannosaurus appeared alongside other Tyrannosaurus-themed mecha in Kamen Rider × Super Sentai × Space Sheriff: Super Hero Taisen Z, while GoZyuJin took Daizyuzin's form during Tokumei Sentai Go-Busters vs. Kaizoku Sentai Gokaiger: The Movie.	Did not appear, let alone fight alongside Megazords from other series until Grid Connection, where it fought alongside the Thundersaurus Megazord and Dino Charge Megazord.
Never destroyed Dora Ladon. 	Destroyed Snizzard who was a robot.