Spamhalter - which version should I use?

Hello,

I want to give Spamhalter a try. My Mercury version is currently 4.80

I have two different versions of Spamhalter installer. One is  V4.6.1.433, sized 2766 kB, which came with my Mercury install I suppose. Second is V4.5.0, sized 2301 kB, which I downloaded from the Lukas Gebauer's ararat.cz website today.

There is another one provided in the Mercury Downloads section here at pmail.com, 4.5.1.166 Spamhalter for Pegasus. Can I use this for Mercury?

Thank you.