I'm using SHV E330S with stock rom rooted fix all.
I9506 vs E330S had same spec.
Could I flashing i9506 rom to my SHV E330S. What happen after that ?
Nothin` will happen because you can not flash I9506 firmware on e330s/l/k or viceversa !
It will FAIL at "Auth" .
You can flash only boot.img, system.ext4.img and cache.ext4.img parts.
These models are 99% the same and with proper custom kernel you can make it fully working. But with stock kernel and knox, you will have different kind of problems.