Well, the biggest problem is that they won't work together. The top crystal is channel 27 (72.330 Mhz) which is a frequency dedicated to RC aircraft. The bottom crystal is channel 62 (75.430 Mhz) which is a frequency NOT dedicated to RC aircraft. In order for your radio to to work properly both the transmitter and receiver must be on the same channel/frequency. Also note here, it is illegal in the US or anybody other than a licensed repair facility to change the crystal in the transmitter of an RC radio. It is ok for the end user to change out the receiver crystal, but not the transmitter.

Ken