Almost all saddle brands offer some sort of "in house" training for saddle fitters and sales reps.
Every single brand we carry has offered us or mandated us to learn from their management team about their saddles. Some of those have been zoom calls with elaborate powerpoint presentations, some of them have been in person, one on one tours and discussions in their factories. As an independent fitter these educational opportunities happen before any demos are put on the truck or brought in for clients to try. If the brand won't disclose important information like tree shapes and sourcing, flocking procedures and materials, or what their fitting philosophy is then we never order their saddles.
For some fitters, this is the only training they ever receive. We call these fitters sales reps, because they have no industry training or knowledge of brands beyond what they can sell. This doesn't make them bad people or bad fitters necessarily, but it does greatly limit their breadth of knowledge and their abilities to make observations, make changes to an existing saddle outside their brand, or contribute meaningfully to discussions about how various saddles fit and may affect a horse or rider.
What Brand Training Looks Like
Brand sales reps usually spend their brand training day going over systems and processes: how to place orders, what leathers are available, what pricing structures look like, and any accessories and tack they offer. The brand manager teaches the sales rep what models are available, what differences there are between models, and what wording or marketing they use to describe these features and differences.
The brand's purpose for this training is to help the sales rep sell more saddles to more clients during appointments. Some brands don't discuss anything about the saddle's construction or fitting philosophy during that training, some do. Some bring saddle fitters to their factories to see the inner workings of the way the saddles are made, and some rent out conference centers and hand out swag. Rarely, and often only once a year or so, some brands will bring their successful sales reps together and take them to a farm and actually see various fittings and usages in action on a horse with a rider.
Independent, Brand-Agnostic Training
Counterpoint to these brand based trainings is something like the Society of Master Saddlers or the International Academy of Saddle Fitters which offer brand agnostic training on how and why saddles should be fit, and how the fit and usage of a saddle affects the horse and rider combination.
Often during these classes, there are a variety of brands and features discussed, identified, shown, and broken down. Various construction methods, types of trees, materials, and biomechanics are displayed both in presentation and in practical hands on applications. These classes last at least a week long, often including 60-80 hours of pre-course work and study, and then a deep dive 40 hours hands on training in small group settings with horses and riders and skilled fitters who are also instructors and experts.
A Word of Caution
Several brands offer a training that they claim is "brand agnostic" but it is really a training in fitting philosophy based on the types of saddles made and sold by a particular brand. Some that come immediately to mind are Schleese and Bates/Wintec. They have their own "certifications" for training and do their own educating over longer and frankly very expensive classes, but they are not testing fitters against any standards other than their own and they don't present fitting philosophies other than their own.
Finding a highly trained and skilled independent saddle fitter often takes some work, and people have various areas of expertise and various levels of training. Ask questions about fitter training, ask about how many brands they are trained on, ask how and where they got that training. Do your due diligence before hiring someone who knows a small sliver of saddle fitting or who only knows how to sell you a saddle rather than how to fit and adjust a saddle. Be sure you are protecting your money and your horse by hiring a good independent saddle fitter with actual non-branded training!