IMO, zero.
They may have an RCN DEU that they wear on occasion, but if they are a purple trade, they are no more Navy than their CA or RCAF counterpart in the same trade. There are occasions where an RCAF or CA person could sail more than most RCN folks.
Now, there are some sub-specialties that do break out between elements (e.g. Sea Log is pretty specific to RCN folks) but an RCAF Med Tech isn’t really that different than a CA or RCN Med Tech.