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Assuming it's not a synthesised receiver (or transmitter) you would probably only have to change one of the crystals, there might not be any retuning required, as they are fairly close already (and might have been aligned to quote with different crystals at the factory anyway).
I'm presuming the picture is the receiver board?, and the crystal is probably the one at the far left - the one in the middle/bottom is most likely the 2nd conversion oscillator which is a fixed value.
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