Vasilly, please put a comparison pic for the petite negri, if you have one so people can see right off.
Again, My strain of Petite Negri is not suitable for small gardens, unless it's in a pot, 'cause it does want to be a tree. It needs heat for proper ripening. Racking my memory from last year's main harvest, the period is about three weeks long, and the figs are hard to hold more than two of (I've gone in, try to pick a handful of fruit, and wind up setting them on the terracing rail-tie, and getting a bowl) so I think it's generally somewhere north of 40g, probably 60 or so dense/pasty grams. The fruits are relatively pyriform, with a very thin and easily cracking skin. The interior is very similar in color and structure to a BI, just less round. The flavor is generally strawberry, fig, mulberry/wine, and when it's good, sweet cut with acid such that it's pretty bright/intense. Not super-sweet. This is all unreliable memory, so I will be paying attention this year, hopefully ripening in good weather--cute little figs are beginning to exit the stagnant phase now.