Hi
@sommebodhy here is something that I found:
MiG-23ML-1: Proposed derivative of the MiG-23ML with improved engines including a single R-100 or R-69 or a twin engine layout consisting of two R-33, also would carry a new R-146 air-to-air missile.
MiG-23MLK: Proposed MiG-23ML model equipped with two R-33 engines or one R-100.
MiG-23 'Flogger-A': Pre-production evaluation model introducing the wing dogtooth but lacking hardpoints for weapons
MiG-23MLDG: Prototype for a fighter based on the MiG-23MLD but equipped with electronic warfare equipment.
Taken from this site:
https://aerospaceweb.org/aircraft/fighter/mig23/