The only downside of using the 7v GP's on a system configured for 5v GP's would cause some very poor GP performance and poor cold starting issues! It would not hurt the GP's at all!
Installing 5v GP's on a system configured for 5v would probably be the best option.
If your system is still configured for OEM 7v GP's? Some on here have installed the 5v GP's on the 7v system and have reported good results so far!
You may want to check with GDE and see if they can tell you what GP program you have and provide you with some guidance since you are running one of their tunes?
Remember, the voltage to the GP's is not constant, the ECM PULSES the voltage as needed based on temperature!
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Supporting Vendor and Moderator of LOST05 Jeep Liberty CRD Limited
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