The ceiling footage of the grate opening up is Sentai footage however all of the jail cell footage is new
Here's Treacheron with the Shark Bros
This is also new footage
Here's another new shot of the 2 Sharks but this time they're outside
Here's new footage of Magna Defender aiming Zika's Dart
Here's a shot of Trakeena's Staff
This shot is when it's the start of Sentai footage
After you see a shot of Leo while in the Megaship Infirmary, it then cuts back to Sentai footage of the Red Shark running through the grass in the Forest Dome.
This shot of the 4 Rangers is when it goes back to new footage.
Once it cuts back to the Shark Brother then it's back to Sentai footage.
This shot is when it goes back to new footage
Here's another new shot of Treacheron with the Shark Brothers but this time Red Shark is on the left, Treacheron is in the middle and Green Shark is on the right
These shots
is when it goes back to Sentai footage.
It then cuts to new footage of the Blue and Green Rangers fighting Treacheron.
Here's another new shot of Treacheron with his Sharks
These shots
is when it goes back to Sentai footage.
These shots
is when it goes back to new footage.
This shot of the Yellow Ranger is when it goes back to Sentai footage.
You see the Sharks growing in Sentai footage. You do not see them drinking the green liquid in the Galaxy ep but in Sentai, you do see the Green Shark drink the Potion before he grows. You don't see Red Shark drink the Potion in Sentai though.

Sentai footage comes from Ginga Episode 24