That might totally be. The bird’s wedding might be the rest of a much larger tradition, the similarities are surely no coincidence, especially the sroki/saraki, although January 25th is still deepest winter. Thanks for the info about Hukanne viasny, I did not know about it!
Today, to ban the winter (and all bad things that happened in the year before) we have the chodojtypalenje – the Witch-Burning on April 30, and for the welcoming of the spring, there is the mejemetanje, the Downthrowing of the Maypole in May.
Some Google Search pictures of mejemetanje