Are these the same thing?
These terms are frequesntly used interchangeably but are in fact NOT the same thing. Although many judging classifications are for a single variety (Kohaku, Sanke and Showa as an example), many other judging classes include multiple varieties. Hakari Moyo as an example include many varieties such as Kujacku (Doistsu and scaled), Kikisui, Yamatanishiki, Kikokuryu (and beni Kikokuryu), etc.. Although many shows elect to call Best in Class as Best in Variety, this is really a misnomer since in actuality they are in fact different and judged differently. How so you may ask? Well, following the recent CFKS, a good friend was asking me about the judging of the "Best Doitsu". No, by definition, this would be a Best in Class award but the show had it set up as a best in Variety award and the judging processes can be very different indeed. With a best in class award, the 1st place koi withn a class and for each size are listed for the judges to pick from since they have already been judged by size previously. This occurs after all bump ups have occurred. As a "Special award" such as Best in Variety, this is not the case since these Varieties have NOT been judged previously by size seperately from the class to which they have been entered. At CKFS as an example, Kumonryu were benched as Kawarigoi (as they should be) and judged as such within that "Class". They also had a "special award" to hilight an individual variety (apart from its normal judging class) and thus, all Kumonryu were then "rejudged" just amongst themselves for this special variaty award.
Likewise, there was not a judging "Class" for Doitsu but a seperate, special award for "Best Doitsu". Now, why would some shows handle this differently from others? Easy, each show has to make an educated decision as to what judging classes to have. On one end of the spectrum, there can be as many as 16 judging classes (more if a club so chooses).
Kohaku, Sanke. Showa, Utsuri, Asagi/Shusui, Tancho, Goromo/Goshiki, Bekko, Gin Rin A, Gin Rin B, Doitsu A, Doitsu B, Hakari Moyo, Hakari Muji, Hakari Utsuri, and Kawarigoi.
Many shows will eliminate "Classes" that they have not had any or low entrants for in the past. As an example, it is not uncommon for awards to go unclaimed for Hakari Utsuri since many shows never see entrants for this classification. Others may have but a few and perhaps in a single size and thus eliminate this classification in favor of combining such with another benching class. Remember, for each Benching class and with a show which has 8 sizes, that amounts to 25 awards (1st, 2nd,and 3rd for each of 8 sizes, PLUS a best in variety award). By combining benching classes (such as entering Doitsu koi into their Wagoi (scaled) version class, the show will increase its "competition" and save on the expenses of what otherwise could very well be unclaimed awards (wasted).
This combining of classifications can also make it easier AND harder on the judges (that's why we make the big bucks LOL). It becomes easier in one regard in that there are less classifications to judge. Balance that against the increased competition within a class and also the more intricate decision process of judging different standards for varying varieties against one another. Then, should there be a seperate "special award" for a variety, the judges are then NOT typically supplied a list of where these koi may be (like they are supplied with for Best in Class judging. Judges then have to identify all contenders themselves by walking all of the tanks instead of knowing where all of these contenders are to begin with. Thus, if a koi is missed and not judged, its not a benching issue, but a judging issue....again why we make the big bucks

.
The whole issue of benching classes (and sizes for that matter) is flexible (as it should be) so that a club (or clubs) can taylor their show for their expected entrants (and in some cases budget). This adds individuality to each show and typically for a more enjoyable show all around for all.
Just some simple thoughts brought on by some questions by a good friend following the CFKS this last weekend.
Steve