They are pronounced the same hence phonetically they are the same but they are not concodered the same letter. If they were the same, people would be unsure if words are written with v or w or use them interchangeably, which does not happen.
V and W are most definitely not considered the same letter in Finnish. Phonetically they produce the same sound but it's not like people use V and W interchangeably. Besides, before the reform in 1800s the w was used for both v and u sounds.
Still it is a lot.