If i go and buy a new 40-ch cobra, and my friend has a brand new 40-ch uniden, are the frequencies for the channels the same?

I know with my Motorola and Cobra FRS's they are

 

Channels are all the same....Cobra can talk to a motorolla, different brands can talk to different brands on the same channel.

 

awesome, what about a vintage CB and a new one?

 

Yes of course vintage stops at channel 23.

The FRS radios are different their channels are proprietary for lack of
a better term..
in other words motorolas channel 9 might be someone elses channel 6

But CBs are Not like that.

 

alright, thanks guys

 

CB Channels 1-40 are all the same. I don't think they have changed, ever, since it's inception back in the day.

FRS Channels are and probably always will be the same as well. GMRS and MURS, ditto.

 

I don't imagine there would be a difference in the channels between a car unit and a handheld?

 

nope
base, portable, mobile all work on the same frequency and channel selection