There are multiple differences between v3 and v4 packages on the "metadata"
level, but perhaps the single most important thing is v4 having immutable
header regions. Related to that, v4 has header-only digests and signatures
whereas v3 digests and signatures are always on header+payload.
The last rpm version that could produce v3 packages was released in 2000. The
last significant v3 packaging out there was Sun Java runtime/SDK which only got
updated to v4 something like ... ten years ago maybe, and that was five years
after everybody else had. In practise, you need to go to a museum to find a v3
package these days.
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