I agree - very unlikely - Each transmitter has its own unique signal -that is why you first bind the two together.
Read again:
http://www.spektrumrc.com/DSM/Technology.aspx
Unlike current narrow band 27 and 75MHz systems, Direct Sequencing Spread Spectrum or DSSS generates a wide signal on a single frequency, and information is encoded with its own Globally Unique Identification number (called GUID) such that the receiver only recognizes the information from its specific transmitter. And with over 4.2 billion available GUID codes, it is virtually impossible for a receiver to be controlled by anything other than its mating transmitter. Spektrum calls this optimized form of modulation DSM-Digital Spectrum Modulation.
Each individual module is factory programmed with its own unique serial code called GUID (Globally Unique Identification code). Once a receiver is programmed to a specific module (called binding) the receiver will only recognize that module ignoring signals from any other sources. And with over 4 billion possible GUID codes, it's virtually impossible for a receiver to listen to anything other than its bound transmitter.
BINDING
Each module has it own unique code (called GUID). The receiver must be programmed to a specific module so that the receiver will only recognize that module, ignoring signals from any other sources. This process called binding is push-button-easy and takes only about 30 seconds.
"LoBatt" is the main enemy