Can I switch to this Insulin Glargine 100IU cartridge from a different Insulin Glargine brand, and are there any differences with the cartridge itself?

Switching between Insulin Glargine 100IU products of the same strength is done fairly often, but the cartridges, pen devices, and injection technique can differ slightly between manufacturers, so it isn't simply a one-to-one swap to do quietly on your own. Your blood sugar response can also shift a bit during a transition, which means closer monitoring for the first few days is wise. Please loop in your doctor or diabetes educator before you switch, so they can guide you on dosing and make sure the new device fits your routine.