No prob to change salt, just keep in mind two things:
The mix up ranges may change. Example if you went with REDSEA CORAL PRO, it mixes high in the ranges which may throw off your dosing depending on water change frequency.
Just make sure you watch your numbers for a bit after change and adjust where necessary.
I use RED SEA PRO, it was worth the extra price as I now dose less between changes.
Also, always mix up the dry salt in the bucket/bag to ensure even distribution of components, and that goes for every brand.