Hello!
I will answer to my own question 🙂
The first Mi-2 is not prserved in Czechia or Slovakia, but in Poland. More precisely at Warsawa. This could be n° 1449, but not confirmed 100%.
The second one is Mi-2See ex German AF registered 94+73. Preserved at Kaltwasser near Rothenburg in Germany.
Happy Hollidays!!
Chaïka12