The 20ga version uses Invector Plus, however the 16ga uses standard Invector chokes.
From what information I could find the Stoeger Condor Over Unders use Browning Standard Invector Pattern Chokes. So yes, these Browning Standard Invector Choke Tubes should work fine in your shotgun. Be sure to select the correct gauge for your shotgun.
According to the Choke Tube Interchange Chart, the Stevens 320 does take the Browning Invector choke tube. It should sit flush on the gun.
Browning states that the MPN:1130363 is for slugs, primarily sabots.
Yes, the Browning Invector should fit the Stevens 320 12ga Field.
Yes, the Browning Invector should be compatible with the Savage/Stevens 301 .410.
The Browning BPS uses the Browning Invector Plus chokes.
https://www.opticsplanet.com/browning-invector-plus-choke-tubes.html
Yes, the Browning Invector Standard should be compatible with the Stevens 320 20ga.
The Browning Invector Standard should interchange with your Winchester 1400 Ranger.
Length of the choke tube is the difference. Earlier guns had the Invector tube and is a shorter tube. The Invector Plus is longer and fits current models, except for the New A5 and 725 O/U's.