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Yes, the difference is very subtle and also depends on light.
In bovinus, it is all and only green.
In your first pic, there are some bronze tints.
Looking from above is the best way to get the bronze tint, also in Hybomitra.

That said, the identification is straightforword based on antennal shape and colour. By far the best (ie. most reliable and easier to spot) feature !

Theo