Well I don't know about the Royal Navy but Napoleon planned on building 150 new ships to add onto his surviving Navy after winning against Sixth Coalition. That would most likely outnumber the British, probably.
You're TL in in 1827, with Napoleon II. IT's a lot more devellopped than Napoleon's 1812 plans.
I was going on the line of thought that since Britain was an island they would have more experienced sailors. The French would be to busy dealing with interal affairs to keep their sailors on par with the British.
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France also had a much higher population than UK at that point in History. There are a few times in history where the French Navy was equal to the RN at least. One was the Reign of Louis XVI before the French revolution - that's why the American revolution was successful -; another was during the rule of Napoleon III. In both cases, the design of the French ships was superior to the RN ones (at least initially) and the French had had time to train their crews (note that France has a tradition of maritime trade and several regions dependent on the sea). Your TL is straight in the middle of this. OTL, the french navy was completely neglected by the Bourbons, which is why the French had to strat again from scratch; this does not happen in your TL.