take a pic of the B-2 and Horton, compare. Similar...in that both are flying wings (in the way that a F-18 and F-15 are "similar" in having twin tail, two engine design). Take the image posted here , hold it next to a US stealth drone...exact same....down to the US style bomb image.Just that the "American" designs are based on German designs from the Horton aircrafts. The similarity comes from similar development aims wrt reduce the RCS and besides that this is still might not be an official graphic, most UCAVs that are currently under developments have the same similarties, since they are developed with the same aims again. Even most stealth fighters share similar shapings, while the changes come from different requirements again (single or twin engine, designed to be a strike fighter mainly (F35), or for air combats (F22), designed to have long range (Pak Fa / FGFA, possibly J20), or simply beeing a lighter stealth fighter for point defence roles, like some Swedish or S. Korean designs. But with the main aim of a very low RCS, there MUST be similarities and with the same aims of UCAVs, their design will be more than similar as well, no matter if US, Russian, Chinese, European, or Indian.