Yes, and no.
Borg Spheres seem to come in two sizes; big (AKA "Tactical") at around 1500m-ish and small (AKA "scout/lifeboat") at around 450m-ish. The Borg Sphere seen in 'Drone' appears to be a variant of those seen in First Contact film and although the models used (both physical and digital) were identical, the notable difference is that the spheres in Drone are dramatically larger, at what appears to be around three times the size.
The Sphere seen in Unimatrix Zero, Part I seems to be the larger variant and the sphere seen in Endgame seems to be the smaller kind.
So yes, out of universe they're totally the same. In-universe, they're not.