Sorry for the delay. Good question.
Overheating is more of an issue with each individual battery so swapping them out after each flight keeps the heat from accumulating. It helps that it is moving and essentially has 4 fans attached to it too...
The issue with switching between those two aircraft would be that your data is then of mixed resolution and won't be able to be reconstructed using most photogrammetry softwares. Another issue is that the flight planning would need to be different since the camera have different fields of view. This would require different flight planning to account for it. If you didn't account for it you would likely have either too much overlap or not enough for one of the cameras.
Such a dataset would not work out very well with Maps Made Easy since there is a requirement to use the same camera and lens throughout the data collection.
I think you would be better off flying