They’re not actually the same thing. Yes, both come out of the urethra, but that doesn’t make them identical. Urine is just waste fluid from the bladder. What people call ‘squirting’ is a mix of diluted urine plus fluid from the Skene’s glands, and it happens because of sexual stimulation, not because the bladder is emptying.
So even if the exit point is the same, the process, the trigger, and the fluid composition are different