I have a transmitter and battery charger labelled Park Zone. I have what appears to be identical ones labeled Hobbyzone. What's the difference? Are they just identical products with different labels?

they are both horizon hobby, so it is quite posible that they use some of the same trannsmitters and chargers and batterys and such. The planes are different though.

I don't what the difference is to be honest...but look at the labels carefully...pay attention to the output current...and if there is a little drawing that looks like a circle pay attention to the poalarity...Just as an example you can't charge Futaba with JR and vice a versa as the polarity is different between those two brands

What I have come to discover, is that the Hobbyzone side of Horizon Hobby is basically for beginners. They brand the Super Cub, Mini Super Cub, Firebird Stratos, Champ, Firebird Commander 2 planes. All are "beginner" type airplanes. Parkzone is the step up brand with their line of full 4 channel planes and mircros; usually all foam based. Then there is the Hanger 9 stuff which is usually high end balsa and ply planes. Those are the differences I see. All are under the Horizon Hobby umbrella. You will also see stuff by E-Flight used with Horizon Hobby stuff too. All of the E-Flight batteries and chargers work on my Parkzone and Hobbyzone stuff too.

The Parkzone/Hobbyzone tx, if 4ch usually will work with any BNF plane they make. The only exception to that rule I discovered is the TX that comes with the RTF Blade SR. It is a 6 channel radio with built in programming explicit to the Blade SR, and while it does work with the other helis, the controls are all wrong for them. <div>
</div><div>An example is the UM-t28 RTF TX can be used with the PZ T-28 BNF.  Note its the 4 channel radios, that will work, the 3 channel ones do not. </div>