They are both with 2.4 GHz so technically there is no difference. The only difference is the scale of this item is 1:15 and this Mattel Tiger Shark is 1:24.

Unfortunately, we do not offer the specific charger separately.

The Hot Wheels® Monster Trucks HW Unstoppable Tiger Shark™ RC Vehicle with product ID HGV87 uses a 2.4 GHz remote control. This modern technology offers several advantages that allow several vehicles to be used side by side without interference. - The 2.4 GHz remote controls encode the signal so that the receiver in the vehicle only recognises the commands that are specifically intended for it, even if other remote controls are transmitting in the same frequency band. - This significantly reduces the likelihood of interference between vehicles, making it possible to operate multiple vehicles simultaneously without any problems. This means your two sons can easily drive their respective Hot Wheels® Monster Trucks HW Unstoppable Tiger Shark™ RC Vehicles at the same time without radio interference.

Hello, I usually charge it overnight. I would say at least 2 hours.