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I'm doing the same thing. oceanic supposedly has more calcium.
so i'm gonna do smaller water changes, like 5% a week, just so the change isn't so drastic.
as long as you keep same temp and salinity, and age it a day, it should be pretty easy on the system.
Instant Ocean seems to work well in our research tanks. One of the professors at the school where I work is using it to do nutrition and maturation studies.
It might be interesting to reference the article I posted a few days ago on the compairson of salt mix's. Their are some significant differences in the two salts as far as trace element makeup.