Generally speaking there is no such thing as "HCl in water". It immediately dissociates into H+ and Cl-, so any solution containing these two (from whatever source) is identical to the solution prepared by dissolving HCl in water.
This is not much different from other solutions. Imagine a solution that is 0.1 M in Na+, 0.1 M in K+, 0.1 M in Cl- and 0.1 M in Br-. Is it a solution of 0.1 M NaCl and 0.1 M KBr, or 0.1 M NaBr and 0.1 M KCl? Or perhaps neither and the question about which salts are dissolved doesn't make much sense, as it is ions present that matter, not the way the solution was made?