To expand on @tightnugs advice - it depends
There's sometimes "clashes" between certain neuts and brands and you have to watch for overfeeding. Brand A might have lots of additional N in their CalMag for example but Brand B doesn't. This will often be compensated for in Brand B either because their neuts have additional N in them or you use a slightly higher concentration. Other things, like root enhancers don't generally have anything in them and can be used freely. Also sometimes some of the emulsifiers or additives don't play nice.
Best option is to email or message the manufacturers of the main neuts you use and ask them if you can use product X with their range. If they're a decent company they should reply.
MJ
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