Replacement heads are not inter-compatible between different brands. However if you use the proper heads of a clearomizer of the same brand and same model, you can use whatever resistance head the vendor offers.
For example, you can use the replacement heads of an iClear 16 in the iClear 16, but not the replacement heads of the iClear 30 in the iClear 16. Vice versa.
The replacement heads in the Kanger Evod and the Kanger Protanks are interchangeable, they both use the same replacement heads.
There is no way of knowing without doing some research what works with what.
To answer your main question, you can change the resistance of the replacement heads as long as the vendor stocks them.
For example, you can use the replacement heads of an iClear 16 in the iClear 16, but not the replacement heads of the iClear 30 in the iClear 16. Vice versa.
The replacement heads in the Kanger Evod and the Kanger Protanks are interchangeable, they both use the same replacement heads.
There is no way of knowing without doing some research what works with what.
To answer your main question, you can change the resistance of the replacement heads as long as the vendor stocks them.