Hey BB, just had a thought that while I realise that my opinion is not based on "will they fit", but more the quality of potential product, and it occurred to me that the only relevant variable between an Iron head and an Alloy head may be the distance from the top of the barrel to the pipe where it enters the head, or the horizontal angle between the two ports.
Assuming the angle will be the same
, I just measured the former (.....the distance from the top of the barrel to the pipe where it enters the head,...) Alloy head is close enough to 1-1/8", so if you or anyone has an Iron head Plungie they can measure I reckon will clear it up...
NOTE; this is only a comparison for Plunger A10's, Alloy/ Iron head interchange, but I guess the same logic can be used for the same difference (Iron/Alloy) on any A10 S/A model or same between A7's.