To clarify - you're saying the PL profile is the same, but you can leverage naked puts higher, thus getting wiped out easier. Do I understand you?
That's only part of it.
The notion of the "P/L being the same" depends upon the question asked. The OP who stated "Naked puts are the same as covered calls" is correct under 2 scenarios. We'll use a "portfolio" of $100K to illustrate... writing covered calls on the entire portfolio equal to the $100K notional value or 10 naked puts on a $100 stock, $3K in premium collected in either case...
Scenario where they are the same risk...
#1. "Cash backed" puts... all of your $100K "portfolio" is in cash to settle your put "just in case"... Market crashes 50%... you use your cash to settle the puts and now own $50K of that stock.
#2. Individual stock you wrote puts on takes a big hit and the rest of the portfolio
doesn't (not a market crash). You liquidate your portfolio for the cash to settle your puts and you now own $50K of that stock.
Scenario where they differ...
#1. With writing covered calls on the full $100K of the portfolio, you now have a $50K portfolio
#2. Instead of writing covered calls, you write 10 naked puts on a $100 stock... and the market takes the same sudden hit of 50%. Then where are you?
a. Your portfolio is $50K
b. But you also OWE $100K to settle your puts. You liquidate the remaining $50K of your portfolio, but you still owe ANOTHER $50K on the puts!
The original statement as made, "naked puts are the same as covered calls" is not correct in the larger sense of risk.
You can't get wiped out writing covered calls. In fact, most long term buy and hold investors should be doing it all the time (tax considerations, excepted)!
Writing naked, either puts or calls, is potentially playing with fire! Lots of examples of "pro" investors getting wiped out with naked writes.