I believe they are 256 channel in conventional mode. If you are going for the lower split version, it will go from approx 440-482ish. My city used to simulcast FD dispatch on 482.xxxx and it worked great along with the ham stuff. As far as FRS, not sure of the legalities since they are very lower power and the TK has the option of high power. I'll let someone else touch on that.
Also, at least on the old DOS software I use, you are not limited to any number of channels per zone. It has a continuous knob so it's very flexible on the programming side. It's been a work horse. Very sturdy and heavy. Great receive and transmit audio. Hope this helps in your decision.