How big is the natural recurve? Depending on length, size, amount etc it can sometimes be more beneficial to straighten it out.
If it looks like the sort of recurve you'd actually try and create, then I'd say go ahead and match it with the other one. If it's an awkward, long soft curve out of the handle that takes it a good 3 or 4 inches above level, matching it and then trying to tiller will be very difficult (if you are a beginner!)
Photos, as always, will let people give a more detailed opinion.