Default [Q] US Variants All the Same except Radio?

With the Sprint S3 root method working for 3 variants (Verizon not released to test), how likely is that they are all the same hardware except for the radios?

I'm hopeful this means custom ROMs (and AOSP ROMs)will be compatible with all the variants, making the US versions simpler to develop for compared to the US versions of the S2.
Phones:
Samsung Galaxy Nexus GSM - CM10 Previews (T-Mobile)
Samsung Galaxy S III (SGH-I747 AT&T) - Stock, rooted, & deodexed (AT&T)

Tablets:
Apple iPad 3 - Stock (sick of chasing jailbreaks)
Asus Transformer Pad TF300T - Test Bed (never on a single ROM for too long!)
Asus Nexus 7 - Rooted Stock JB

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