To clarify a bit: The Rourke-Frew (Ontario) tartan - is registered with the Scottish Register of Tartans. I wrote them a quick email asking their advice regarding the hunting variation and this was their response.
"As you are seeking to create a variation of your own existing tartan, there will be no problem just changing the colours but preserving the geometry of the original sett. We would not be so accomodating however if you were intending to create a colour variation on someone else's design! The design would have to be compared against the rest of the Register to ensure that the new colours created a tartan that was 'sufficiently different' to all others already recorded.
I would suggest that the tartan name would need to be 'Rourke-Frew (Ontario) Hunting' to clarify the connection between the tartans, and the rationale should also explain the close relationship of the tartans."
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