Short answer - No
Long answer - 2.4ghz and 40 mhz refer to the frequency that the transmitter works on. 2.4ghz sets don't use crystals to change frequency. Instead, there are a set number of channels within the 2.4ghz band (around 20ish if i remember right). The transmitter just finds one that is free and uses that. The receiver knows which transmitter to take direction from as they will have previously been bound to one another (different sets and manufacturers have different methods for doing this)
If you want to use 40Mhz you will require crystals etc and will expect a fair bit more potential problems with interference although with an antweight this probably won't be a problem due to the distances involved. Also make sure if you are using a dual conversion receiver, you use dual conversion crystals.
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