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Hello Nikita,
Well, I still stick with Scelionidae, because indeed they are ver much alike. The thing I always noticed for Platygastridae is that they are more or less a little 'humpbacked', by which I mean that the head always seems to be a bit bend down, so the thorax seems to be a little humped. In this case I don't see that, so I would still guess it is Scelionidae!:D
Greetings