According to B&N's specs on their website the Glowlight Plus doesn't segregate content like the earlier Nook's did. With that knowledge then no current devices segregate storage space for sideloaded content anymore (Nook was the only one that did). All of the devices you mentioned have 4GB of storage, but I'm unsure how much is actually available for content (I'd guess 2.5 to 3GB).
Paperwhite = 4GB, unsure how much is actually available for content
Glo HD = 4GB, unsure how much is actually available for content
Aura H20 = 4GB, unsure how much available for content, plus microSD slot
Glowlight Plus = 4GB, 2.5 GB for content (both Nook store and sideloaded)
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