N&B Block vs LEGO (任天堂 ブロック vs レゴ)

I just performed a small experiment. For some time, I had been wondering about the compatibility between Nintendo's N&B Block bricks and - its source of inspiration - the original LEGO bricks. In fact, the experiment is so simple that I don't understand why I had not tried it before.

Let's first take a closer look at the respective rectangular bricks, side by side. They have identical dimensions and are overall very similar, except for the names on the top of the studs.

N&B Block brick (left) and LEGO brick (right)

When we flip them over, we see more differences.

Nintendo N&B Block - Introduction (任天堂 ブロック, 1968-72)

In the late 60s in Japan, Nintendo created a range of construction sets with colorful plastic blocks. It was called Nintendo Block (任天堂 ブロック), which was shortened to "N&B Block" or just "N&B".

Assortment of models built with Nintendo N&B Block (1968-72)

The Nintendo N&B Block series was copyrighted to Nintendo, without any license from LEGO, however it was clearly "inspired" by the bricks from the Danish toy manufacturer.

Nintendo N&B Block leaflet