The footage of the Lights of Orion being out in outer space is new footage.
This shot of the Lights is when the Sentai footage starts
Here's Impostra and Trakeena even though you don't get a good shot of Impostra in this shot
This shot of Impostra is actually Sentai footage. You can tell because of the windows since those are the windows that are in Captain Mutiny's Castle
The actual shot of Impostra transforming into Treacheron is Sentai footage however it then cuts into new footage due to Impostra-Treacheron eventually walking into the same shot with Trakeena.
Once you see Destruxo then that's another start of Sentai footage.
This shot of the Rangers is the start of new footage. Once you see Destruxo again then that's back to Sentai footage.
This shot is back to new footage. It then goes back to Sentai footage of Destruxo.
This shot of the Rangers while in the same shot as Destruxo is actually new footage which is when the new footage begins again. It then fades into a commercial break and once it returns from the commercial break, it starts up with Sentai footage of Destruxo opening his Jar.
This shot of the 5 Rangers is new footage. It then cuts back into Sentai footage of Destruxo.
This faraway shot of Destruxo and the Rangers is back to new footage.
This shot of the Magna Defender is when it goes back to Sentai footage
This shot of Destruxo being in the same shot as the 5 Rangers is back to new footage
This shot of Orion Destruxo is when it goes back to Sentai footage.
This shot is also back to new footage
Once it cuts to a front shot of Destruxo then it's back to Sentai footage once again
The footage of the fiery explosion occurring in front of the Rangers as a result of Destruxo's Orion attack is new footage so while Destruxo attacks in Sentai footage, the explosion happens in new footage.
Once you see a front shot of Destruxo in Orion Mode again then that's back to new footage.
These shots
are new footage.
Once you see the front shot of the Magna Defender then that's back to Sentai footage.
Once Impostra says "They're all such fools" as she exits the screen, it then cuts to new footage.
The Stingwingers come out to try to stop the unmorphed Rangers in their tracks. It then cuts to Sentai footage of Destruxo in his Orion Mode
All of the fires are Sentai footage except for the explosions that go off in the same shot as the unmorphed Rangers
The footage of Destruxo as shown on the Scorpion Stinger's Viewing Screen is all Sentai footage.
The fire spreading down a hill is also Sentai footage
All following Destruxo in Orion Mode stuff is Sentai footage as well
This shot is new footage.
This shot is also new
Once the Rangers demorph, the following shot of the Lights is new footage.
Once you see the Magna Defender again then that's back to Sentai footage but only if he's by himself in the shot.
The footage of Treacheron being in the jail cell is new.

Sentai footage comes from Ginga Episode 23