I guess "almost" depends on how you rate something. If you think something must be 95% plus to be almost as good, then probably not. If you're realistically trading size and some performance for concealability (your requirements may vary from situation to situation), then it could be considered "almost" as good. If it's the difference between being able to carry CCW or not, the a small .380 might just fit the bill.

In the site testing I referred to earlier (scroll to the bottom of the link I posted), they had these results:

Hornady 90 grn FTX Critical Defense .380 ammo—14.1” penetration, .39” expansion and 910 FPS. Some expanded as much as .63” but didn’t penetrate to that ideal 12-18” per FBI standards.

The new Winchester 147 grn Ranger T series 9mm ammo has 16.5” penetration, .74” expansion at 941 FPS but that is an exception in 9mm ammo as most only expand in the .40’s/.50’s”.

Most of the .40S&W ammo reliably expands to .60’s/.70’s” while staying in the FBI preferred penetration zone (12-18”).

The new Winchester 230 grn Ranger T series .45 ammo penetrates 14.5” and expands to an amazing 1.0” while moving at 900 FPS. That’s truly impressive. But most of the .45 ammo available expands to somewhere between .40’s to .80’s.

Now full disclosure, I pack a .45 for duty and before that always carried a 40. I like big bullets but can tell you from personal experience that larger calibers don't always stop a bad guy in his tracks. 12 gauge buckshot or slugs work much better as do certain rifle bullets. But we're talking pistols and CCW here. And as always, the OP like the rest of us will have to make his best decision based upon his particular CCW needs which can vary by situation to situation.