Dear Karol,
Very nice pictures! You chrysidid is greedy!
You're identification is correct, but it's impossible to go further.
Females of
Hedychrum nobile and
H. niemelai can be easily separated only looking at the ventral surface of the abdomen.
When you have only pictures of living specimens, you can use an other system:
if the specimen is really large, more than 8 mm, it is
H. nobile . If it is small, it's really impossible to ID.
Do you remember the size of your specimen?
At a first sight, it looks quite large.
Cheers
Paolo.