Once the opening credits ends, there's an exterior shot of 1 of Terra Venture's various domes and then it cuts into Sentai footage of the beach and the ocean.
Here's a shot of what is more than likely the Ocean which appears to be new footage
Once you see an interior shot of the cave that Maya is in then that's obviously new footage as well.
All footage of Loyax while he's in the same cave as Maya is new footage.
Here's new footage of Loyax

Once you see Deviot on the Ocean Dome ground then that's another instance of new footage as well.
Here's Loyax in the same shot as Maya
Here's Loyax fighting a monster during a flashback he's having during the time in which he was once a good warrior
Here's another new shot of Loyax in his flashback
Here's new footage of Loyax with his Sword and his Ball and Chain thing
Once Maya's morphing sequence ends, it then cuts to an up-close shot of the Yellow Ranger's holster which is when it goes back to Sentai footage.
Once you see a Needle in Loyax's back, the following footage of Deviot is also Sentai footage.
Here's new footage of Giant Loyax in the same shot as the Pink, Red and Green Rangers
Once Red Ranger says "Okay, let's go" and then they start to run off and then it cuts back into Sentai footage of Giant Loyax.
This is when the Loyax vs Galaxy Megazord fight starts in new footage.
Here's new footage of the Galaxy Megazord
Here's another new shot of the Megazord and Loyax
After Deviot activates the system that begins to self destruct Loyax and leaves the area, you then see a solo shot of him as a Giant sparking up which is when it goes back to Sentai footage.

Sentai footage comes from Ginga Episode 40