Yes, a Glock 19 9mm magazine can be used on a Glock 23 since both firearms are chambered in 9mm.
You cannot just swamp them out no.
Yes, the glock 23 and 32 and the 31 and 22 magazines are interchangeable.
No. Because a Glock 26 is chambered in 9mm, as a Glock 23 is chambered in .40 s&w. For example you can use a Glock 22 (full size) in Glock 23 (compact) and in Glock 27 (sub-compact) But you cannot use Glock 27 mags in Glock 23 or Glock 22.
13 Rounds.
Standard magazine- 13 rounds. There are optional 10, 15 and 22 round magazines.
The Glock 22 is a full frame pistol.. a .40 S&W version of the full sized Glock 17, whereas the 23 is a mid-frame, and is essentially a .40 S&W variation of the Glock 19.
300 or so
Different calibers. The Model 19 is in caliber 9x19mm, the Model 23 is a .40 caliber. The 19 holds more ammo in the standard magazine. External dimensions and weight are the same.
@300 USD
Glock 23, IMO.
Yes