Hi Simon
Yes, it has the same "mechanical size" as the original 1TB M.2.
2280 refers to the width and length of the M.2 drives.
From a forum:
The length and width of M. 2 storage can often be deduced from the model name: For example, an "M. 2 2280" card is 22 millimetres wide and 80 millimetres long. The length varies from 30 to 110 millimetres.
Greetings
Bruno