The 3 Ninja Streaks are new footage.
This shot appears to be new footage
This shot could be Sentai or original but right now I'd say it's Sentai After futher review, this shot is Sentai footage and comes from Hurricanger Episode 7.
Here's what appears to be new footage of Red
These shots  are when it goes back to Sentai footage. In this case, the Sentai footage is still coming from Episode 7 at the moment.
Here's new footage of Navy's Boot on Red's chest
Strangely the reshot was badly done since that isn't where the Sentai footage had Navy's boot at on Red.
These shots   are also new footage.
These shots of Navy's Thunder Staff is new footage
 
   
Yes, all of that which includes Navy taking it out from his holster is all new footage. Yes, even the transformation of his short Staff to the longer version is new footage.
These shots   are back to Sentai footage, still from Episode 7.
Here's new footage of the 2 Rangers
Here's Red's Ninja Sword in new footage
Here's new footage   of Zurgane teleporting into the quarry or the "Monster-Con" as Cam would say.
The footage of Zurgane seen on Cam's computer monitor is still new footage.
This back shot of Zurgane is new footage
This front shot of Zurgane is also new footage
This up-close shot of Zurgane's Sword while it's still in his shoulder is when it's back to Sentai footage. This scene of Zurgane comes from Hurricanger Episode 10.
Here's new footage of Red.
Here's new footage of Red and Zurgane fighting
These shots    are when it goes back to Sentai footage, the footage comes from Episode 10.
The footage of Zurgane as shown on Lothor's ship's Viewing Screen is all Sentai footage.
Here's new footage of Zurgane while the 3 Wind Rangers are down. This was reshot because they wanted to teleport him out there.
This shot of Blue, Red and Yellow is when it goes back to Sentai footage, this shot and scene comes from Hurricanger Episode 10
Here's when it goes back to new footage, this shot of the 2 Thunders - Navy and Crimson
Here's also new footage
Here's new footage of the Thunder Rangers with a glowing special effect coming from their hands/arms
Here's when it goes back to Sentai footage from Episode 10  

 
These up-close shots of Blue, Yellow and Red look to be new footage  

Here's when it goes back to Sentai footage from Episode 10
This side shot of the 3 Rangers is new footage
along with this new shot of the Rangers taking the Thunder Tsunami Cycles' blasts
Here's when it goes back to Sentai footage from Ep 10  
These shots look to be new... they look to be new but after closer examination, they are definitely scenes that are Sentai footae that comes from Ep 10  
Here's shots of Yellow which is when it goes back to new footage  
Here's when it goes back to Sentai footage from Ep 10
This shot of the 3 Wind Rangers being down is back to new footage
Here's when it goes back to Sentai footage, a shot of the 2 Thunder Rangers by the Cycles. Also comes from Ep 10
Here's when it goes back to new footage  
This side shot of Crimson is when it goes back to Sentai footage from Ep 10
Here's when it goes back to Sentai footage of the 2 Thunder Rangers
Here's new footage of the Wind Rangers looking at the Insectizord and Beetlezord
Once you see the Hawkzord coming through the airport holographic portal then that is when it goes back to Sentai footage.
This shot of the Wind Rangers is another start of when it goes back to Sentai footage
Here's a shot of Cam's Computer Monitor being in Sentai footage
Here's new footage of the individiual zord cockpits being damaged
   
   
Here's when it goes back to Sentai footage from Ep 10  
It goes back to new footage once you see the visorless Rangers in the zord cockpits.
Lothor's ship's Viewing Screen is showing Sentai footage of the Megazord continuing to spark up, that Megazord footage comes from Ep 10.
There is an aerial shot of the damaged Storm Megazord sparking up which is a Sentai footage that comes from Hurricanger Episode 10.