Olivate 1000 is that like Olivem 1000? Likely so… Anyway, that one is a emulsifier which contains a ‘wax’ and a nonionic low HLB emulsifier: why exactly the blend has a medium HLB suitable for o/w is a mystery to me, maybe due to impurities such as free fatty acids?).
Varisoft EQ65 is a real alternative to BTMS-50 because it’s a conditioning quaternary ammonium compound like any other, just from renewable resources and, more importantly, it’s readily biodegradable. Olivem 1000 ain’t a good alternative for a quat. It may be useful in a conditioning/styling product (ask someone else what he/she thinks, I dunno) but it won’t have the slip a quat imparts. Varisoft EQ65 has exactly that
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Both products contain identical parts but that’s like comparing bikes with cars just because they both have wheels. Their composition, effect, and behaviour are entirely different and hence, there’s no reason not to combine them. Whether there is reason to combine them is up to you to decide.