Is Fuzhou dialect the same as or similar to Minnan dialect?

It's different. There is a big difference.

Give a few simple examples:

Eating: Fuzhou dialect sounds like "a little slow"; The pronunciation of Minnan dialect is similar to "Mei Jia".

How to play: Fuzhou dialect sounds like "Ka Liu"; The pronunciation of Minnan dialect is similar to "kicking a peach".

The number 1, 2: Fuzhou dialect sounds like "shrinking" and "blue"; The pronunciation of Minnan dialect is similar to "urgent" and "cold".