Can you please confirm the correct part number for the other powered head available for this DC35 (Type A)?
I can't as the machine doesn't have a serial number. This is why with these items we ask people (if local) to bring them down. I have a box of those heads and they are always a problem to match at a distance. Part numbers Dyson say fits X machine often dont, etc.
We seldom sell heads and batteries online for exactly this reason. The minimal profit in them makes a likely "doesn't fit" return put us in the red on the deal.
Most eBay and other online sellers have no clue what fits what, they only copy other people's listings or distributor info. One mistake in that chain causes a discrepancy as you have already seen.