The footage of the evil White Ranger clone fighting the 3 Monsters that plays on Mesogog's Screen is Sentai footage and it originates from Abaranger 30.
White Terrorsaurus in the Fortress  
New footage of Zeltrax
Terrorsaurus, Zeltrax and Evil White clone which is all new footage
New footage of Blue, Red and Yellow
Sentai 
New 
Sentai 
New 
New footage of Red Ranger with him having Ethan and Kira's Lasers
Here's Trent in Ranger form arriving to the battle scene on his ATV however he already fired on Terrorsaurus and the evil Clone
At the current moment the shots of the White Terrorsaurus as shown on the Computer Monitor, don't know whether they're new or not however once you see the Megazord in the Woods just outside of town is when it goes back to Sentai footage.
Tommy and Trent's Gem power hitting the White Shield
New
Conner's red-colored dream involving the last Dinozord and the Triassic power is Sentai footage.
Sentai
New
Here's the next noticeable shot that shows that this shot of Terrorsaurus holding onto Blue Ranger is Sentai
New
Sentai 



This shot of Terrorsaurus by the water is Sentai footage but it could be from Abarager 30 or 31, can't tell you at this point in time.



I believe this shot is just reused Sentai footage from earlier in the episode
These shots were also reused Sentai shots from earlier in the ep  
I believe this shot of the Rangers in the water is new
New footage of the Red Ranger with the White Shield



This shot is Sentai footage which originates from Episode 31
New
Sentai shot from 31
New
Sentai
New
Sentai
New shot of Terrorsaurus
Also new footage
This shot of the Red Ranger being thrown (here is in front of a building) could be Sentai but it could be new, can't tell you right now
Definitely Sentai 
New footage 
Sentai
New footage of Triassic since they had Kevin/Ethan and Emma/Kira shoot this scene along with a suited actor
Sentai
New footage of the Sword of Triumph hitting White Terrorsaurus while in the Triassic Dimension
Sentai
New 
Sentai



Sentai footage comes from Abaranger Episodes 30 and 31.