Whats the differance between the two?

The Ko Propo Ex-10 Helios and the JR Z-1 Radio is the Exact same radio the only difference is the JR offers there synthesized RF module and RS310 receiver. The KO uses RF-501F module and the KR-302F Receiver. other then that they are the same radio, if I am not mistaken i believe the JR has on the bottom of the radio developed by ko propo.

Hope this helps,

The websites for each radio vary widely. So, it is hard to compare them. I don't know why JR doesn't have any spec's.

http://www.jrradios.com/Products/Default.aspx?ProdID=JRP374075

http://www.kopropo.com/EX-10_helios.htm

The Ko Propo Ex-10 Helios and the JR Z-1 Radio is the Exact same radio the only difference is the JR offers there synthesized RF module and RS310 receiver. The KO uses RF-501F module and the KR-302F Receiver. other then that they are the same radio, if I am not mistaken i believe the JR has on the bottom of the radio developed by ko propo.

Hope this helps,

You are correct in this. However the Ko version can be purchased cheaper as a Tx only so you can then add the Spektrum module and reciever. The Z-1 w/ reciever and no servos will be around $339 (Horizon) and the Ex-10 Tx can be purchased for around $199 (ebay stores) plus $179 (Horizon) for the Spektrum Pro mod/Rx. $99 for the reg module and $79 for the reg Rx. But with some wise searching you can find this stuff cheaper.

You are correct in this. However the Ko version can be purchased cheaper as a Tx only so you can then add the Spektrum module and reciever. The Z-1 w/ reciever and no servos will be around $339 (Horizon) and the Ex-10 Tx can be purchased for around $199 (ebay stores) plus $179 (Horizon) for the Spektrum Pro mod/Rx. $99 for the reg module and $79 for the reg Rx. But with some wise searching you can find this stuff cheaper.
My brother did the same thing, That is a good idea if you wanna run spektrum.