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The transformer/cap is the same as far as I know, so yeah. Pretty sure you just need to add the right size ignitor to make it into an HPS. Thats the way the non-digital dual ballast work too... The switch just takes the ignitor in/out of the circuit.
With 400w and 600W HPS ballasts, I like to run MH bulbs as [iirc the 600] the Sodium runs a 4.5A Ballast, MH normally a 3.5A ... so running a MH 'hotter' gives out more lumens, but reduces bulb life.... not a concern........ BUT... if you go the other way round and stick a HPS bulb into a MH Ballast, I think you will find it runs it too 'cold' ... not enough Amps for it to kick out the normal lumens.