What is the difference between M26 and M66?

What is the difference between M26 and M66?

The model is M26 in China and M66 for overseas export

The m26 module and the m66 module are the same. Can it be used instead of the m26 module?

YES,However, you need to pay attention to whether the main serial TX/RX is consistent

In a study that will be done by paying attention to the pin connections, what is the possibility of it working by replacing the M26?

Others may not need attention

Hi. Do you have a picture of the M25 gsm module? I don’t know what kind of module.

Sorry, I don’t have a corresponding entity of M25 module