There's probably a good explanation as to why the two toys sound so similar... Any time a company needs to come up with sound effects, whether for a game, music, toy, movie, or anything else that may need sound effects, there is a large pool of generic sound effects. Some of them are highly identifiable, and can be found in hundreds of different places. Crowd noises, screams (one comes to mind, the guy in Return of the Jedi, being thrown off the sand skiff in the fight over the sarlaac pit... That's been recycled thousands of times).
Simply put, that is probably a generic baby-gurgling/cooing/noise-making sound that is identifiable in several other places as well.
But you can bet your ass that after all this negative media attention, the powers that be will likely remove it from the generic pool.