It depends on whether you're talking about the whole drum assembly, or just the upper drum (spinning part).
This older forum post would suggest the drum with assembly fits in the NV-HS1000, of which the older revisions have the VEH0651 drum assembly. The VXP1561 seems to be the assembly used in the newer revision of the NV-HS1000 and the NV-HS900 which is a little newer. The full assemblies are likely interchangeable as long as they fit physically. I've successfully used the drum assembly from a AG5700 (same drum assy as NV-FS200/FS88) in a NV-HS1000, so I know there is some cross-compatability.
I don't think upper drums on their own are interchangeable though, I know someone who checked the compatability between the VEH0651 and one from the newer revision which presumably is the VXP1561 and they won't fit each others lower drum assemblies.
EDIT:
Picture of disassembled head drums from the person mentioned, From the left, head from NV-HS1000 (VXP1561 I think), NV-HS800 (VEH0651), and NV-F55 (Normal VHS with 4+2 hifi)
panasonic_drums.jpg