Not a surprise at all, we already know that growth control genes are retained in mammals (and birds/dinosaurs) from very early multicellular life. Why in that case would you reinvent the wheel in the case of communication genes? This isn't a surprising result it's almost blatantly obvious.
What would be worth finding out is any correlations between comms. genes and conditions like autism etc, whether there is a possibility that ancient genes are being reactivated when they shouldn't be and causing the problem (to make an analogy, like trying to run a windows 10 device on a windows 3.1 driver, things are not going to end well).
Humanity seems to love to over complicate matters, assuming that between two very different groups of animals chemistry must be very different, while blethering on about the kiss principle everywhere else. It makes no sense to keep reinventing the wheel when you've got something that works..
I just gotta go feed my Velocichicken...