or both devices can have the same adobe ID - in fact both devices will auto-copy the PCs ID , I think, or will for sure copy it with a little manual encouragement....
which is what you'd want if say you had a library epub loan - you could then read it on either make of reader.
in fact you can go directly from library (overdrive) to device via the device browsers but they are such a pain to use it's better, IMHO ,to go library -> PC -> calibre -> device.
I think sony store ( as was- dead now ? ) used Adobe DRM, same as libraries do .
the only thing that won't work is buying a kobo format book for your kobo H2O then trying to put that on your old sony.. the books you have already from sony store should go onto kobo OK - via USB - and be readable if you set up lobo with same adobe ID. you may have to find where sony stores them on your PC first though & that's obscure AFAIK.
or maybe it's all much simpler, as kobo took over sony store they may now have a way of painlessly delivering your previously bought content to your new reader ?. you say most of your books have already transferred to their store...
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