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Gen 5 Glock 19 and Glock 23 = interchangeable?

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I recently purchased a gen 5 Glock 23 and was thinking about using that as my conceal carry. I'm also a big fan of lasers. I purchased a Viridian C5L ECR laser as well as a Viridian Glock 23 level 2 holster. For some reason even with the laser attached the Glock 23 didn't fit into the holster even after letting loose the retention on it.

So after some thinking I was gonna try to get a Lasermax guide rod laser, but after looking on the Lasermax website they didn't have said guide rod for Gen 5 Glock 23's, but they got Gen 5 Glock 19 guide rods.

So I guess my questions is: can I use a guide rod made for a Glock 19 in a Glock 23?

Also, can I use a Glock 23 in a Glock 19 holster?