Different sizes for sure and stihl uses bigger attach nipple. Even different micron sizes of filtering. Some weighted some not.
Stihls newest for theirs. Husky newer filter. Trimmer etc will be smaller.
Common one I see in cheaper saws and older poulan.
Common husky
I found out recently that the 525LS weedwhacker uses the standard husky fuel filter, not one of the smaller ones with the metal nipple/body. If I had just looked in the tank instead of going by the recommendation, I could've saved a few bucks.