Is the pull force of multiple connected magnets the same as a single magnet of the same size?

Due to the surface treatment and irregularities of the magnets, magnets stacked together have lower strength than a single equally sized magnet.

Magnets without surface treatment with a flat surface would have the same strength as a single equally sized magnet.

However, the reduction in strength due to surface treatment and magnet irregularities is very small and almost negligible for larger magnets.

Therefore, if a magnet is not available in the required size, you can achieve the necessary size by combining several smaller magnets.