zlacker

It's only really about the intent of the voice to sound like the original. Reaching out to the originals first implies intent, so it makes the case easier.

It would be harder to find a case if they simply just hired someone that sounds similar, but if they did that with the intention to sound like the original that's still impersonation, only it's harder to prove.

If they just happened to hire someone that sounded like the original, then that's fair game IMO.

IANAL