There seems to be a common belief that sewing machine bobbins are interchangeable between machines.  Perhaps this stems from the fact that you can buy them ready-wound?

If bobbins are causing you grief — loose stitches, bird‑nesting or uneven tension — you’re not alone. These are some of the first things we troubleshoot in my Beginners Sewing Classes, where you’ll learn how to wind, insert and adjust your bobbin correctly.