Are IRIS .net gateway dlls backward compatible with Cache?

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Did some quick testing replacing Intersystems.Data.CacheClient.dll with Intersystems.Data.IRISClient.dll and ran against Cache 2018.1 and IRIS 2019.1. Seems to work in both cases. Is it a safe assumption that the IRIS dlls are backward compatible with Cache 2018.1?

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It's not safe to assume compatibility between IRIS and Caché .NET gately DLLs. They may be coincidentally compatible at the moment, but as IRIS evolves, maintaining backwards compatibility will be a lower priority than enhanced features, performance and reliability. Is there a particular reason you tried this, or just curiosity?

Thanks for the recommendation Raj - in the short term we have customers with both Cache and IRIS and prefer not to have logic to determine which dlls to use.