Differences between Galaxy Mega and the Astro Megazord

Galaxy Mega 	Astro Megazord
Both parts are man-made by the organization INET. 	
The shuttle was implied to be created by NASADA at the request of Zordon.
The Astro Megaship was of alien origin, made on the planet KO-35.
The Megaship served as the first headquarters of the INET organization. 	Only the Rangers and their robot assistant Alpha 6 resided on the Astro Megaship.
Remained as the Megarangers' primary base before command was moved to the I.N.E.T. Moonbase, but the place where they meet is still technically inside of it.  	The Megaship has always been the Space Rangers base, nor did they use the Mega Vehicles secret location as a headquarters.
Never left earth's orbit. 	The Astro Megaship was used to travel to distant planets.
The Megaship had no AI to speak of, aside from being briefly programmed to fight without a pilot as the Galaxy Mega on one occasion. 	The Astro Megaship was controlled by a sentient AI called DECA.
Fought in tandem with the RV Robo alongside the other Megaranger mecha. 	Never fought alongside the Turbo Megazord.
The Megaship was not used by the Rangers during Seijuu Sentai Gingaman as it did not appear in that series, instead appearing only with the Megarangers in both teams' crossover special. 	
The Astro Megaship reappeared in Power Rangers Lost Galaxy as the Ranger's main way to travel through space in addition to appearing as the Astro Megazord during a crossover.
The Megaship was never destroyed. As no replacements were needed, it remained the only one of its kind. 	
The Megaship was destroyed during the finale of Power Rangers Lost Galaxy and in Forever Red a Mark II of it is revealed.
Took part in the battle against Lost Highness Rakushaasa during Hyakujuu Sentai Gaoranger vs. Super Sentai. 	A replacement was built years later and used during the events of Forever Red, but never took Megazord form.
The Megaship remained primarily docked in the INET Moonbase after the debut of the Mega Voyager unless if it was needed. 	The Astro Megaship was never docked in the Mega Vehicles secret location.
Fought alongside most of the other main Super Sentai Robos during the 199 Hero Great Battle crossover movie. 	Only fought alongside the Galaxy Megazord during the team up with the Galaxy Rangers.
The Galaxy Mega took a long time to fix after the final battle against Guirail and did not return to battle until the final battle against the Neziranger. Was later badly damaged by Yugande during the series endgame and did not re-appear until the following seasons' crossover special.	Despite taking heavy damage from Darkonda and Ecliptor in their powered-up states the Astro Megazord was very easily repaired and did not remain inoperable for very long.