Circuit's future vision of those time holes opening up in the sky is Sentai footage.
The shot of Frax in his Workshop is Sentai footage.
Here's a Sentai shot of the Space Center
This shot is new.
It then goes back to Sentai footage once you see Serpicon again.
It then goes back to new footage when you see a sign that reads "Silver Hills SPACE CENTER"
The shot of the C-bots that Trip sees is Sentai footage.
However the following shots including the shots in which you see the C-bots tying up some employees wearing white lab coats is new footage.
After you see the recycled shot of the Bio-Lab exterior, it then shows you some recycled Sentai shots as well of the Silver Guardians running down a darkened hallway and pulling out in their SUVs.
However once you see the "Space Center" sign then that is when it goes back into new footage.
Once you see Serpicon again then that is when it goes back to Sentai footage.
Here's a shot of them inserting a new graphic onto the Sentai Computer Screen
It then goes back to new footage once you see Trip.
This shot
The shot of the tied-up white lab coat employees is still new footage.
Once Jen, Lucas, Katie and Wes morph, as soon as you see Serpicon again then that is when it goes back to Sentai footage.
Once you see an up-close shot of this graphic then it's when it goes back to new footage.
However it then cuts back to Sentai footage as soon as you see the red dot as seen here
After showing a little bit of the Sentai fight between Quantum and Serpicon, you'll eventually see a cut back to Trip.
This shot is when it goes back to Sentai footage.
Any shots of the countdown clock in Trip's area (the clock with the red-colored numbers) is new footage.
It then cuts back to the Sentai footage of the Yellow Ranger trying to keep a door open.
As Wes is beating up on some C-blots, it then cuts back to Trip. It then cuts back to the Sentai footage of Yellow.
The shot of Quantum and Serpicon preparing for a duel to the finish, it then cuts back to Trip.
Yes, even the shot in which the compter display graphic reads "Invalid Access Codes" is new.
It then cuts back into Sentai footage as soon as you see the Yellow Ranger.
After Katie tells Lucas and Jen to get the people out, it then cuts back to new footage of Circuit.
Once you see the Red Ranger then that is when it goes back to Sentai footage.
After Blue and Pink go through some C-bots, it then cuts back to Trip. It then cuts back to Sentai footage of the Blue and Pink Rangers. After Katie tells Trip to hurry, it then cuts to new footage of Circuit.
This shot appears to be Sentai footage.
These shots   are when it goes back to new footage.
After Serpicon sparks up a bit from the Quantum Defender's blast hitting him, it then cuts to Trip. Once you see the Yellow Ranger then that is when it goes back to Sentai footage. After you see Red falling down due to exhaustion, it then cuts back to Trip. It then cuts back to Sentai footage of the Yellow and Red Rangers. It then cuts back to new footage of Circuit and Trip. Once you see Serpicon again in the middle of growing then that is when it goes back to Sentai footage.
These shots   are when it goes back to new footage.
This shot of Giant Serpicon looks to be new footage due to reviewing the Sentai footage of him and I do not recognize this scene from the Sentai ep at all.
Wes calls for the Time Jet in new fotage. It cuts into recycled Sentai stock footage of the Toy Jet flying as it's growing big. There's a recycled Sentai stock of the 5 Rangers on the Time Jet however that recycled Sentai stock shot of them on the Time Jet was also used in the counterpart Sentai episode.
All zord footage is Sentai footage. The shot in which Serpicon becomes small is also Sentai footage.
This shot is actually when it goes back to new footage which sadly means that you don't get to see Eric use his Badge to capture the frozen Serpicon within a Canister.

Serpicon's Sentai footage comes from Time Episode 46