Things were chaotic during the time Ford was attempting to run DeTomaso Automobili in late 72-late '73, so yes, the dash changes and a host of others (outside gas fill, different seats etc) were set for early '73. But not all "1973" cars got all the changes. I know of at least 2 early '73-builds that have the early dash.
As far as being 'stock', no radio at all was supplied by Ford or by DeTomaso. 100% of the radios were locally installed by whatever dealers had around. The car is worth whatever the seller is willing to accept.