Yes, New Home was the Westernized name first used by the Janome company.
Line up all the bobbins on a flat surface, lay something rigid & flat across them, use a pencil or other small object to poke each one, the ones that slide out without touching your ruler (or whatever rigid thing you used) mark with a Sharpie. Test run both types.
Bobbin case tension test:
Put a threaded bobbin in the little case thingy that you snap into place under the machine.
Holding the thread, let it hang.
If it spins out unwinding the tension is too loose.
If you can bounce the thread repeatedly & the bobbin & case don't slide at all, the bobbin tension is too tight.
If the bobbin slides a little with each bounce, it's close to correct.
Tighten or loosen the bobbin tension by the tiny screw on the bobbin case, turn only a 1/4 turn at a time
. Righty tighty, lefty loosey.