Both of those are especially sensitive to ammonia.
Avoid panda cories, they are the most stressable species, and it wouldn't be a good mix to have them being transported around.
Don't know about loaches. Larger cories would probably be hardy though.
You'd need sand for both too, but I think you could handle filling and emptying as long as you rinse it really well the first time.
Loaches would be a good choice if you have naturally soft water, cories could handle slightly harder water depending on species.
If you can, I'd test pH and hardness from the taps of both places you go back and forth from, if there's large differences you'll need an especially hardy species to cope with the changes..