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Generally speaking, not specifically about the two versions at play, the client/server combination will only work at the highest level of the lowest component. That is to say that your 18.08 client will only be able to do the things that it was able to do with an 18.08 server, any new features/capabilities that the 19.02 server has won't necessarily work with the 18.08 client...now mind you, the number of features introduced between the two versions should be minor, meaning that a vast majority of the system should work without issue....I don't know what the delta between the two is, but I wouldn't expect it to be vast....so, you will obviously want to test it out before full implementation.
One thought for you. Due to the fact that your issue is with reporting...you could stay on 19.02 for everything except reporting, and have a single Mid-Tier that's not used for most of the interactions with Remedy, and have just that one 18.08 server on the side for when needing to do the reports you are having problems with....all of this would be a temporary stopgap till BMC's able to address your issues in the next hotfix/patch/release.