They rarely are the same. Most mfg make things to work for a 5 to 8 year period. (if its even that long anymore.) Then in the case of saws they have to meet emissions, and be at a certain price point. Now where does the consumer fit into this? They don't. Just the long and short of it.
Manufacturers must adhere to the ridiculous EPA mandates that continuously become more and more stringent. They do what they can to provide a useful engine/tool for the intended purpose, but have to dance around all the bogus EPAs restrictions. Hence, 50:1 F/O mix
recommendations. If you talk to most ANY pro logger who uses the larger saws, he will tell you that everyone uses between 20:1 to 32:1, depending on the saw. Typically, the bigger saws are run harder for longer periods of time and thus become much hotter than the smaller saws. Extra lubrication is required because the crankcase does not collect the 'excess' oil like a smaller saw being used for cutting firewood that runs at load intermittently.
Sure, for you F/O
recommendation-stickler people playing around with your small-displacement yard tools in your own small properties perhaps one or three hours per month on average, 50:1 is likely almost adequate and costs less in oil (artificial savings). But if you're running those saws/tools eight hours a day, five to six days a week, not only are you expending a hell of a lot more calories and eating far more protein than the average person, but you're also using a lower F/O ratio to extend the life of that hard-working saw/tool.
Even a good-sized blower that is running for hours on end requires a lower F/O ratio. Some people here believe the bigger-displacement blowers are low-load tools. Think again. They're running at around 9800-10500 rpm continuously for hours on end when blowing a substantial amount of leaves in the autumn. At least on my farm they are.
So, believing that the manufacturers are recommending the best F/O ratio for these 2T tools is pretty darn preposterous when considering all the variables.