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It depends on what is damaged in your G5. If the motherboard and PSU was not damaged by the leaking coolant (which is unlikely), then yes, you could just replace the G5 CPU modules with replacement liquid cooled, or air cooled G5 CPU modules, and it should work. But it is very unlikely that there is no damage to the motherboard and/or PSU, caused by leaking coolant.

I have not tried replacing liquid cooled CPU modules with air cooled G5 modules, but others who post to these forums have made that switch successfully, so do a search through these forums and you will find at least one thread that talks about switching from liquid cooled G5 CPU modules to air cooled G5 CPU modules. Check your motherboard traces carefully first, and if possible, test the PSU under some kind of load, to make sure it is still working properly, before you go spending money on replacement G5 CPU modules.