The SSL clones and such are based on the ssl compressor and it is similar to the one in the console and probably the same as the xlogic ones you can buy now.....the older e/g/g+/ even j had a vca(the compressing element) by dbx the 202c it has been replaced by another vca (that) because the dbx one is discontinued. the xlogic doesn't sound like the older grey fx384, but this is kinda immaterial because the rack unit ssl doesn't sound exactly like the console.
All of them have different meter ballistics in my experience. One persons gr to 6db is anothers 4db.
The place where they sit electronically is slightly different when you are running converters with way lower headroom in to a box that was designed to run at a specific voltage, than when you are running the console into it.
SSLs have a sweet spot that is where there is a combination of distortion and as CLA put it "sag". Thats why there is usually some gain stage trickery going on in the form of bussing. Let alone if you are running the motors as automation or the vca's as automation there are different things that happen to the sound.
My main point is that rather than shooting for a number on 1 piece of gear that is only a small part of a bigger picture, used by someone you admire. Find your go to setting given the sum of all the gear you have. Chasing someones mixes with exactly the same gear you have is hard enough. Without the centerpiece (let alone the same tracking) its impossible to get the same mix.
@CFH i used to use something similar to this but found that the calibration was too time consuming. Are you on a console? Do you run tones to calibrate the system?