So is it (very) similar, yes... without question!
But, the patent on the axis lock design expired, all companies are now ok to use it, and Hogue has been doing it better by many reputable reports (incl. beefier springs)... Ganzo was blatantly doing it while the patent was still owned by BM, as blatent Chinese theft of intellectual property with complete disregard to any law... not even close to the same... do we fault every company that uses back locks or frame locks as "ripping off" designs? No. A good useable design is a good useable design, and if another company uses it and even does it well, then there is absolutely nothing to fault them on... similarly to companies using holes instead of studs inspired by Spyderco... Syderco has the patent on the perfect circle, but an oval is fine right? Once the patent expires, I definitely would not hate another company for using a circle.
2nd, while extremely close in design, definitely even inspired by, enough angles and subtle differences are in fact not identical, as well as the addition of the tank adjustment cut out, (remember Hogue also manufactured the HK Karma), that I can comfortably say, that while it is without a doubt a VERY similar design, with full legal respect to intellectual property laws, it is not necessarily a "clone"... did we knock every company who made a legitimate quality knife similar to a Buck 110?
Lastly, as others have pointed out, for all I/we know the same designer is behind both, (Elishewitz?) and simply got a new job with a new company? Or owned the design rights and contracted it out with a new company? Or maybe hogue actually paid Benchmade to use the design? Without that information, I'm not about to start throwing stones. "If" it is a blatant theft of design, I'm sure it would turn up in a court case sooner rather then later, being 2 American companies where intellectual property is still protected, and law suits are hardly uncommon in our culture, so because I have yet to hear BM raise a stink about it, I have to (at least for now) assume it was all done legit without foul play involved.