Footage of Gasser is Sentai footage. The 1st group of civilians that breathe in the poison smoke is new footage.
Also the overhead shot of Terra V being covered in all poison smoke is Sentai footage.
Here are the Jet Jammes
 
 
 
These shots
are new footage.
All of the following shots of the Rangers is new footage until you see Red Ranger in midair after jumping up.
The scene in which you see Gasser hammering away at the base of the stone GalactaBeast(s) is taken from Ginga 7.
The footage of the explosion of sparks coming from the stone GalactaBeasts is also taken from Episode 7.

Footage comes from Ginga Episodes 6 and 7