Can I use the same atomizer
/ tank with another liquid?

atomizer / flavor

You can use the same tank with another liquid.
It is recommended that you clean the catomizer / tank when you change your flavor.
That is in order to meticulously remove the former flavor.
After a few vapes, the former flavor should disappear.
Another factor is that if you don’t clean your atomizer,
after a couple of puffs you will get to taste your new flavor.
If it does not, the coil may be compromised.