According to this page “https://williammeaghersdubbingcollection.weebly.com/the-little-mermaid.html”, it claims to have the original dub and says the following:

“There are two Finnish dubs. The first from 1990 and the redub from 1998. The original dub was released on VHS in the early 90s and due to the overwhelming demand the dub has with Finnish viewers, getting a physical copy is near impossible unless you know where to look. The original dub is extremely rare for that reason. The redub has received multiple complaints regarding its casting choices and changed dialogue. The redub has been released to VHS in 1998 and is the dub that is widely available on DVD/Blu-Ray and online.”

I hope you find it, i wish you a lot of luck! 😃