Quoted from RC_like_the_cola:And I know those guys that voiced them in the 80's aren't still doing the voices. Most likely using the current voices under the Nickelodeon contract
The original actors still do the original voices when hired. There’s a Honda commercial that features them.
They wouldn’t use the current voices because that’s an entirely different show.
Stern is using sound alikes based on the 80s show that this theme is based on. We’ll get to judge how they sound when the stream happens today.