The cameras marked "Leitz-Minolta CL" were sold in the Japanese market, and AFAIK, were the same as the "Leica CL" . After Leica killed the CL, Minolta wanted to keep going, and so they did, developing the Minolta CLE, which had many improvements- longer base RF, AE, TTL flash, and addition of 28mm frames in the VF. The CLE also uses 1.5V button batteries and not the mercury one of the CL. The CLE is electronic, you need the battery for the shutter, the CL only needs a battery for the meter, I believe.
The supposedly 25 improvements were made during the short production run of the CL, and it takes a Leica tech to see if they were incorporated in any particular camera. Some techs did the improvements as part of regular CLAs, so its even more unclear which cameras were improved. If a camera hasn't been "improved" by now, it may be tough to do, I don't know the availability of parts. Others can tell you who is the "best" tech, but I had my CL CLA'd at Essex in New Jersey (just a stone's throw from here) for a really good price.