They are both artillery of course. The RCHA is the senior component of the Artillery branch, all regular forces artillery units are part of the RCHA. All other militia and reserve units are part of the RCA.
There was be finer points that a gunner would best explain.
If you belong to one of the Reg Force Artillery Regiments, you will wear the appropriate RCHA flashes. If you don't you wear RCA, even if you are Regular Force. Reservists wear RCA.
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