Does the magnitude of a physical quantity change with change in system of units?WHY OR WHY NOT????PLZZZZZ ANSWER SOON

Yes magnitude of a physical quantity change with change in system of units.
If Length = 14 km. here magnitude is 14 and unit is km
As we know 1 km = 1000 m.If we change kilo meter to meter. then 14 km = 14000 m.
So here magnitude is 14000 and unit is meter. So if we change unit then magnitude also changes.